In Praise of Philosophy and Other Essays

Author(s): Maurice Merleau-Ponty Year: 1970 (English combined edition; Part 1 original 1953, Part 2 original 1968) Type: Book (combined volume: inaugural lecture + course summaries)

A combined volume containing two texts of different genres. Part 1, In Praise of Philosophy (Éloge de la Philosophie), is the inaugural lecture Merleau-Ponty delivered at the Collège de France in January 1953 upon assuming the chair of philosophy, published by Gallimard the same year (translated by John Wild and James Edie, Northwestern UP 1963). Part 2, Themes from the Lectures at the Collège de France, 1952-1960 (Résumés de cours), collects the end-of-year summaries Merleau-Ponty wrote of his Collège de France courses — short, compressed reports that the Collège required of its professors, published posthumously by Gallimard in 1968 (translated by John O'Neill, Northwestern UP 1970). The two texts together document the intellectual arc Merleau-Ponty traversed in his teaching between 1952 and 1960 — an arc whose final years (1959-1961) are documented in the more exploratory course notes of *The Possibility of Philosophy*.

Core Arguments

Claim: The philosopher "possesses inseparably the taste for evidence and the feeling for ambiguity". Good ambiguity is not equivocation but a theme — it "contributes to establishing certitudes rather than menacing them". Because: What makes a philosopher is "the movement which leads back without ceasing from knowledge to ignorance, from ignorance to knowledge, and a kind of rest in this movement". Even philosophers who wanted a positive philosophy (Lavelle) refused to install themselves in absolute knowledge. The ambiguity is not a deficiency but the lived shape of the philosopher's relation to truth. Against: Any philosophy that either promises absolute knowledge or collapses into equivocation. Both mistake the mode of philosophical life.
Claim: Bergson's real trajectory is not from "intellectualism" to "intuitionism" but "from a philosophy of impression to a philosophy of expression". The "wholly positive Bergson" of intuition-as-coincidence is the polemical Bergson against Taine and Spencer; the best Bergson is the one who discovers the "retrograde movement of the true" — the retroactive projection of truth into the past. Because: Bergson's later analyses (of language, of reading, of "auscultation") cannot be reconciled with intuition-as-coincidence. "It is perfectly true that each philosopher, each painter, considers what the others call his work as the simple rough sketch of a work which still remains to be done. This does not prove that this work exists somewhere within themselves and they have only to lift a veil to reach it" (IPoP §II, p. 24). The real Bergsonian intuition is "a becoming-meaning, which builds itself in accord with itself and in reaction against itself". Expression is not the copy of a prior intuition but the very mode in which truth comes to itself. Against: Both the "wholly positive" Bergson of friends and enemies who took him as mere antithesis to intellectualism. Against the retrospective illusion that treats the philosopher's finished work as the unfolding of a "prenatal inspiration".
Claim: Socrates's irony is a "distant but true relation with others" — not rebellion and not accommodation, but a form of obedience that is also resistance. "He knows only that there is no absolute knowledge, and that it is by this absence that we are open to the truth." Because: Socrates believes in the gods and the City "more" than his accusers do — "in another way, and in a different sense". He stays and is tried because fleeing would make the sentence against him true; by staying he challenges the tribunal. His irony is "naive" in Hegel's sense — not self-conceited but structural: both adversaries are justified, and "true irony uses a double-meaning which is founded on these facts". But MP also criticizes Socrates on his own principles: when he taunts his judges ("I will not stop philosophizing even if I must die many times"), he "yields to the giddiness of insolence and spitefulness". Socrates himself teaches us to correct Socrates. Against: Commentators who say "it is all a misunderstanding" (Socrates and his judges would have agreed if they understood each other); romantic irony "which is equivocal, tricky, and self-conceited"; the view that the philosopher's relation to the city is either pure rebellion or pure conformity.
Claim: Philosophy is not atheism — it "displaces" the sacred, locating it "at the joining of things and words" rather than fixing it here or there as a thing to be affirmed or denied. "One bypasses philosophy when one defines it as atheism. This is philosophy as it is seen by the theologian" (IPoP §IV, p. 52). Because: The 1950s French debate reduces all philosophy to two positions (de Lubac's Christian humanism vs Nietzschean "antitheism") — but both treat philosophy as the negation of God or the affirmation of God. Philosophy, when it is not theological, is neither. It radicalizes the question of the divine rather than solving it. The "criticism of idols" that Christianity introduced into history is continuous with philosophy's critique of necessary being. Bergson's refusal of conversion (to stay "among those who tomorrow will be the persecuted") is the emblematic philosophical act: "his conversion would have been a desertion, and an open adherence to Christianity could not prevail over the God who was hidden in the sufferings of the persecuted". Against: De Lubac's and Maritain's readings; Nietzsche's "antitheism" as "inverted theology"; the post-war French reduction of all philosophy to theism-vs-atheism.
Claim: Historical meaning is "immanent in the interhuman event, and is as fragile as this event". Neither Hegel's "universal history" nor the dogmatic-Marxist "dialectic of matter" captures history's real structure — that is captured by a linguistic model: history is the symbolic space in which contingency and rationality mutually produce each other, as in Saussurean language change. Because: Hegel's history is "the dream of history" because "he finds in it only the sense he has already placed there". The Marxist "dialectic of matter" is "the height of subjectivism" because it is "in things so far as [one] thinks them". But Marx's own insight — that history is "the situation in which all meanings are developed" — is captured better by Saussure than by Engels. Linguistic change has "an internal logic even though it may not be clearly thought out by anyone", and "each institution is a symbolic system that the subject takes over and incorporates as a style of functioning". This is what historical meaning is. Against: Hegel's absolute knowledge; Engelsian dialectical materialism; dogmatic Marxism; any philosophy that treats history as "an external destiny"; Sartrean commitments that subordinate truth to the party.
Claim: Philosophy "limps" — it "dwells in history and in life, but it wishes to dwell at their center, at the point where they come into being with the birth of meaning". It is "the Utopia of possession at a distance". This limping is "its virtue": the philosopher's detachment is a form of engagement, not its opposite. Because: The philosopher's "dialectic, or his ambiguity, is only a way of putting into words what every man knows well — the value of those moments when his life renews itself and continues on, when he gets hold of himself again, and understands himself by passing beyond". Machiavelli "is the complete contrary of a machiavellian, since he describes the tricks of power and... gives the whole show away". Descartes' refusal to choose between Galileo and the Holy Office is not philosophical neutrality but abdication: "by refusing to speak, Descartes also refuses to vindicate and to bring into action the philosophical order in its proper place". Philosophical truth is Alain's "momentary" truth of the event — "it is necessary to see it, to say it, to do it at this very moment, not before nor after in ridiculous maxims". Against: The view that philosophical detachment is neutrality; the man-of-action vs philosopher opposition ("this man of action is himself not all of one piece"); the honoring of Descartes "for not having taken sides between Galileo and the Holy Office".

Arguments from the course summaries (1952-1960)

Claim (Course 1, 1953, The Sensible World and the World of Expression): "Perception is already expression." The passage from sensible world to world of expression is not a leap but an amplification of an expressivity already in perception; the body schema is the "thinking apparatus" that makes it possible. Because: Gestalt accounts of apparent motion show external forces inserted "into a system of equivalents... like signs in a language"; Head and Kohnstamm on body schema show the body as "the seat of a certain praxis"; painting and cinema extend perceptual expression by inventing "emblems" (not copies) of movement; "motion is inscribed in the texture of the shapes". Against: Reductions of perception to sensation or to sheer conceptual construction. The "universe of ideas" view that "owes nothing" to perception, and the empiricist reduction of higher expression to brute perception.
Claim (Course 5, 1954-55, Institution in Personal and Public History): The concept of institution (counter-concept to constitution) resolves the antinomies of the philosophy of consciousness about time and intersubjectivity. An instituting subject "exists between others and myself, between me and myself, like a hinge". Institution is what endows experience with "durable dimensions" in relation to which later experiences acquire meaning. Because: For a constituting consciousness, "there is nothing in the objects capable of throwing consciousness back toward other perspectives"; the relation to one's own past is "a series of fragmentations". Institution works otherwise: the past is "the field of my becoming during that period", present to me through the meaning-sequence it opens, not as an object reconstructed by the present. Examples: oedipal conflict (conservation and transcendence); Proust's analysis of love (past and future crystallize on each other); painting (problems like perspective "rarely resolved directly" but from another direction); mathematical idealization (whole numbers as "special case"). Phenomenology is either "an introduction to absolute knowledge, which remains a stranger to the adventures of experience, or phenomenology dwells entirely within philosophy; it cannot conclude with the predialectical formula that 'being exists'". Against: Husserl's constituting subject; the closed-universal-history conception; any reduction of historical understanding to a play of already-there categories.
Claim (Course 7, 1955-56, Dialectical Philosophy): Genuine dialectic is an "uneasy equilibrium" characterized by (1) contradictories whose negation of the negation is "the fecundity of contradiction", (2) a "subjective dialectic" that makes being appear "before someone as the response to an interrogation", and (3) a circular motion that makes the dialectician "a perpetual beginner". Its deviations are instructive because they show the ways dialectic can lose its equilibrium. Because: Mere "relativist reconciliation" or "identification through equivocation" produces "bad dialectic"; the negation of the negation is what makes contradiction operative. The "subjective" sense is not that subject and object are merely "relativized" but that "it is by means of what is most negative within subjectivity that it needs a world and by means of what is most positive within it that being needs non-being". The circularity is not closure but integration: "everything has always to be rethought in the dialectic". Against: Hegel's "positively rational" that "finally transforms the dialectic into a system"; Kierkegaard's "decision" as "an endorsement... of the task of distinction between contradictories" (a "religious atheism"); Marx's turn to a "naturalist philosophy which localizes the dialectic in the preparatory phase of human 'prehistory'"; Sartre's nothingness as "equivocal in principle: its loyalty is a refusal, its refusal a loyalty".
Claim (Courses 8-9, 1956-58, The Concept of Nature I & II): Western ontology is caught in an "ontological diplopia" (Blondel) — an oscillation between a "positivist" ontology (being exists; nothingness has no properties) and a "negativist" ontology (doubt is first; liberty is the model of infinity). The task is not to overcome the diplopia dialectically but to describe it. Contemporary physics and biology help: they refuse the alternatives of mechanism and idealism, and they suggest a "lateral" rather than frontal conception of Being. Because: Descartes' mechanism flows from his "ontological complex" of necessary being and pure nothingness; Kantianism declines the philosophy of nature in favor of a humanism that reduces nature to "meaningful objects"; Schelling's "'barbarous' principle which can be transcended, but will never be as though it had never existed" breaks the complex. Husserl's Ideen II return to the Subjektleib discovers "another nature" beneath Cartesian nature. In biology, Uexküll's Umwelt and Portmann's "organ for being seen" show that animal being is already production (faire); "the transcendence of one [species] by the other is, so to speak, lateral rather than frontal"; "all corporeality is already symbolism". Against: Cartesian mechanism; Kantian humanism (including Braunschvicg's neo-Kantian salvage); Cassirer's critical idealism; Lukács's dismissal of Schelling as "mystic"; neo-Darwinian "ultra-mechanism or ultra-finalism".
Claim (Course 10, 1958-59, Philosophy as Interrogation): "With Hegel something comes to an end. After Hegel, there is a philosophical void." Marx, Kierkegaard, Nietzsche "start from a denial of philosophy" — but their "destruction of philosophy" may preserve its essence. Their questions illuminate our present; their solutions are inadequate to it. Philosophy today is interrogation — not because interrogation is a method but because the "universe of living paradoxes" that Husserl and Heidegger open requires a mode of philosophy that does not resolve the question into an answer. Because: Marx, Kierkegaard, and Nietzsche "anticipated a world which turns out to be our own", but "their answers... seem to us too simple. They were conceived in opposition to metaphysics yet within the shelter of the solid world of which metaphysics is a part". Husserl's late turn to the Lebenswelt and the *Ineinander* shows philosophy as "the enterprise of describing, outside of the logic and vocabulary at hand, the universe of living paradoxes". Heidegger's "there exists, opening toward something... that which is not nothing" — the rose "without why" — is "the proper theme of philosophy". The preobjective Being "between the inert essence... and the individual localized at a point of space-time" is what philosophy interrogates. Against: Reading Marx/Kierkegaard/Nietzsche as already possessing solutions we can apply; reading late Heidegger as "humanism in place of metaphysics"; reading Husserl as "phenomenological idealism".
Claim (Course 11, 1959-60, Husserl at the Limits of Phenomenology): Husserl's late manuscripts — "Origin of Geometry" and "Umsturz der kopernikanischen Lehre" — reveal that ideality and historicity have a common source, and that the earth is not a body (Körper) among others but "ground" (Boden) in a privileged sense. Ideality "has its anchorage within itself, in the flesh of its sensible or natural existence"; the earth is the "source" from which bodies are "drawn through division". The body (Leib) has a kinship with the earth and, through the earth, with other bodies. Because: Geometry exists "only in the 'space of humanity'"; the Urstiftung / Nachstiftung / Endstiftung structure shows ideas have "a subterranean history or genesis of ideality". "The only way to grasp an idea is to produce it". Writing makes ideality subsist — but also "petrified, sedimented, latent or dormant". The Copernican view of the earth as "one body among others" forgets the earth as Boden: "the ground from which all rest and all movement are separated, which is not made out of Körper". There is a "kinship between the being of the earth and that of my body (Leib)". Against: Readings of Husserl as Platonist; purely psychological readings of ideality; the Copernican abstraction in its ontological use; the "represented infinite" of classical science.
Claim (Course 12, 1959-60, Nature and Logos: The Human Body): The human body has a "double nature" — "sensible and the 'sensing'" — and this doubleness is "a philosophy of the flesh as the visibility of the invisible". The body is a "natural symbolism" prior to conventional symbolism. The Freudian unconscious is refigured here as "feeling itself" and the "primordial unconsciousness" as "the initial yes, the undividedness of feeling". Because: Contemporary embryology moved beyond preformation/epigenesis to "a flux of determination"; the discovery of "fields" and "gradients" points to "a philosophy of structure" or "philosophy of something". Instinct is "an oneiric or narcissistic preparation of external 'objects'"; symbolism emerges already at the animal level. The body-schema is "a lexicon of corporeality in general, a system of equivalences between the inside and the outside which prescribes from one to the other its fulfillment in the other". Freud's concepts "are corrected and affirmed once they are understood... in terms of corporeality taken as itself the search of the external in the internal and of the internal in the external". Against: Driesch's entelechy as "complicated system of negations"; mechanism and vitalism; "the body-instrument" / "thought-pilot" dualism; Freudian "unconscious representations".

Key Findings

The 1953 inaugural lecture opens with the good-ambiguity / bad-ambiguity distinction, which the wiki had thus far traced primarily through Hegel and the 2022 course notes — this is the earliest statement of the distinction in MP's oeuvre
Course 5's concept of institution (instituting subject vs constituting subject) is the locus classicus for this concept in MP's work and is a major missing piece from the wiki's existing treatment of MP's late ontology
Course 10 is where MP first formulates philosophy as interrogation in print — several years before The Visible and the Invisible deploys the term
Course 8 contains a direct in-text attestation of Schelling's "barbaric principle" in MP's own voice (1956-57), earlier than the November 1960 working note hitherto cited on the wiki
Course 11 is the primary textual anchor for MP's reading of Husserl's Umsturz der kopernikanischen Lehre — the "earth as Boden" reading that underwrites the wiki's precession page
Course 12 explicitly formulates "the human body as a natural symbolism" (p. 204) — direct primary-text support for a concept the wiki had previously based on Knight's 2024 reconstruction
The volume contains MP's most sustained reading of Bergson (IPoP §II) — the characterization of Bergson as moving "from a philosophy of impression to a philosophy of expression" and the reappropriation of the Bergsonian "retrograde movement of the true"
MP's critique of Socrates on Socrates's own principles (IPoP §III, p. 45) — "he yields to the giddiness of insolence and spitefulness" — is surprising and cuts against pious readings

Concepts Developed

institution — counter-concept to Husserlian constitution; Course 5 is primary
ontological-diplopia — Blondel-derived structural co-presence of positivist/negativist thought; Course 9
interrogation — first explicit formulation in print as "Philosophy as Interrogation"; Course 10
good-ambiguity — earliest in-print formulation of the distinction; IPoP §I
natural-symbolism — "the human body as a natural symbolism" (Course 12 p. 204) is direct textual support
barbarian-principle — earlier primary-text attestation than the November 1960 working note; Course 8 p. 148
fundamental-thought-in-art — Courses 1, 2, 3, 5 give the pre-V&I arc of "perception is already expression" → "writer's work is a work of language" → "interrogation of painting"
pre-objectivity — Courses 8-12 develop this as a continuous stratum

Concepts Referenced

ineinander — Course 10 p. 182 introduces the term from Husserl ("the Ineinander"); the 2022 notes make it MP's own method-term
lebenswelt — Courses 10-11 on Husserl's late trajectory
precession — Course 11's earth-as-Boden is the primary anchor
interanimality — Course 9 on Uexküll/Portmann
nonphilosophy — Course 10 as proto-formulation ("denial of philosophy" may preserve its essence)
philosophy-of-reflection — Course 5 is a distinctive critique via institution rather than genealogy
Stiftung / Urstiftung / Nachstiftung / Endstiftung — Course 11 on Husserl's Origin of Geometry
Wahlverwandtschaft (affinity of choices) — Course 4 on Weber
Umwelt / Merkwelt / Wirkwelt — Course 9 on Uexküll
Subjektleib — Course 8 on Husserl's Ideen II
Urpräsenz — Course 8
Boden / Körper — Course 11

Key Passages

"The philosopher is marked by the distinguishing trait that he possesses inseparably the taste for evidence and the feeling for ambiguity. When he limits himself to accepting ambiguity, it is called equivocation. But among the great it becomes a theme; it contributes to establishing certitudes rather than menacing them. Therefore it is necessary to distinguish good and bad ambiguity." (IPoP §I, p. 3) — opens the volume; earliest in-print attestation of the good-ambiguity distinction.

"What makes a philosopher is the movement which leads back without ceasing from knowledge to ignorance, from ignorance to knowledge, and a kind of rest in this movement." (IPoP §I, p. 4) — compact definition of the philosopher as interrogative life.

"This exchange between the past and the present, between matter and spirit, silence and speech, the world and us, this metamorphosis of one into the other, with a transparent gleam of truth, is, in our view, much more than the famous intuitive coincidence, the best of Bergsonism." (IPoP §II, p. 35) — the claim that Bergson's best insight is expression, not coincidence.

"It is perfectly true that each philosopher, each painter, considers what the others call his work as the simple rough sketch of a work which still remains to be done. This does not prove that this work exists somewhere within themselves and they have only to lift a veil to reach it." (IPoP §II, p. 24) — against "prenatal inspiration" and the retrospective illusion.

"The expression antedates itself and postulates that being comes towards it." (IPoP §II, p. 35) — the retrograde movement of the true.

"He knows only that there is no absolute knowledge, and that it is by this absence that we are open to the truth." (IPoP §III, p. 44) — MP's Socrates.

"When he says to his judges: I will not stop philosophizing even if I must die many times, he taunts them and tempts their cruelty. Sometimes it is clear that he yields to the giddiness of insolence and spitefulness, to self-magnification and the aristocratic spirit." (IPoP §III, p. 45) — MP's criticism of Socrates on Socratic principles.

"One bypasses philosophy when one defines it as atheism. This is philosophy as it is seen by the theologian. Its negation is only the beginning of an attention, a seriousness, an experience on the basis of which it must be judged." (IPoP §IV, p. 52) — against the French 1950s reduction of philosophy to atheism-vs-theism.

"Every appeal to universal history cuts off the meaning of the specific event, renders effective history insignificant, and is a nihilism in disguise. As an external God is ipso facto a false God, so an external history is no longer history." (IPoP §V, p. 58) — the false-God / false-history parallel.

"Historical meaning is immanent in the interhuman event, and is as fragile as this event. But precisely because of this, the event takes on the value of a genesis of reason." (IPoP §V, p. 57) — the positive version: history as contingent genesis of reason.

"Each institution is a symbolic system that the subject takes over and incorporates as a style of functioning, as a global configuration, without having any need to conceive it at all." (IPoP §V, p. 62) — institutions read through Saussure.

"The limping of philosophy is its virtue. True irony is not an alibi; it is a task; and the very detachment of the philosopher assigns to him a certain kind of action among men." (IPoP §VI, p. 67) — the programmatic claim of the inaugural lecture.

"Philosophy and absolute being are never above the rival errors that oppose each other at any given time. These are never errors in quite the same way, and philosophy, which is integral truth, is charged with saying what in them it is able to integrate." (IPoP §VI, p. 68) — against philosophical neutrality.

"Perception is already expression." (Course 1, p. 79) — the programmatic claim of the 1953 course.

"Thus what we understand by the concept of institution are those events in experience which endow it with durable dimensions, in relation to which a whole series of other experiences will acquire meaning, will form an intelligible series or a history — or again those events which sediment in me a meaning, not just as survivals or residues, but as the invitation to a sequel, the necessity of a future." (Course 5, pp. 108-9) — the definition of institution.

"In man the past is able not only to orient the future or to furnish the frame of reference for the problems of the adult person, but beyond that to give rise to a search, in the manner of Kafka, or to an indefinite elaboration." (Course 5, p. 114) — institution as the condition for a "search".

"Sleep is not an act, the operation, the thought, or the consciousness of sleeping; sleep is a modality of perceptual activity — more precisely, it is the provisional involution or differentiation of the latter." (Course 6, p. 120) — against Sartre's account of sleep/imagination.

"Our waking relations with objects and others especially have an oneiric character as a matter of principle: others are present to us in the way that dreams are, the way myths are, and this is enough to question the cleavage between the real and the imaginary." (Course 6, p. 121) — the passage that licenses "perception is the true unconscious".

"The Hegelian notion of the negation of the negation is not a solution of despair, nor is it a verbal artifice to escape from embarrassment. It is the formula of every operative contradiction and by leaving it aside one abandons dialectical thought itself, which is the fecundity of contradiction." (Course 7, p. 128) — MP's defense of the negation of the negation.

"[Schelling] considers the 'abyss' itself to be an ultimate reality and defines the absolute as that which exists without reason (grundlos)... The erste Natur is an ambiguous principle, or, as he puts it, a 'barbarous' principle which can be transcended, but will never be as though it had never existed, and can never be considered secondary even in relation to God." (Course 8, pp. 148-9) — direct in-text attestation of the barbarian-principle in MP's voice, 1956-57.

"At the root and in the depths of Cartesian nature there is another nature, the domain of an 'originary presence' (Urpräsenz) which, from the fact that it calls for the total response of a single embodied subject, is in principle present also to every other embodied subject." (Course 8, pp. 155-6) — the Husserl-Ideen-II result.

"Do we not find everywhere the double certitude that being exists, that appearances are only a manifestation and a restriction of being — and that these appearances are the canon of everything that we can understand by 'being,' that in this respect it is being in-itself which appears as an ungraspable phantom, an Un-ding? Could we not find what has been called an 'ontological diplopia' (Blondel), which after so much philosophical effort we cannot expect to bring to a rational reduction." (Course 9, pp. 163-4) — the formulation of ontological-diplopia, citing Blondel.

"The transcendence of one by the other is, so to speak, lateral rather than frontal, and one meets all sorts of anticipations and reminiscences." (Course 9, p. 170) — lateral transcendence.

"All corporeality is already symbolism." (Course 9, p. 171) — the pivot from nature to logos.

"With Hegel something comes to an end. After Hegel, there is a philosophical void. This is not to say that there has been a lack of thinkers or of geniuses, but that Marx, Kierkegaard, and Nietzsche start from a denial of philosophy. We might say that with the latter we enter an age of non-philosophy. But perhaps such a destruction of philosophy constitutes its very realization." (Course 10, p. 174) — opens the interrogation chapter.

"Everything occurs as though these philosophers had anticipated a world which turns out to be our own, as though the world had made an effort to resemble what they had foretold. For once, thought was in advance of history, and the questions they raised illuminate the present in which we live. By contrast, their answers, the solutions which they offer to that history which they anticipated so well — whether it is Marx's praxis or Nietzsche's will to power — seem to us too simple." (Course 10, p. 175) — the "questions yes, answers no" thesis.

"It is this preobjective Being, between the inert essence or quidditas and the individual localized at a point of space-time, that is the proper theme of philosophy. It can be said of this Being — the rose, said Angelus Silesius, is 'without any why,' blooms because it blooms, the rose-spectacle, the rose-totality — that it has no cause outside of itself, and moreover is not the cause of itself, that it is without ground, being the absence in principle of any ground." (Course 10, p. 184) — the proper theme of interrogation. The Silesius rose.

"The inherence of the self-in-the-world or of the world-in-the-self, what Husserl calls the Ineinander, is silently inscribed in an all-embracing experience which composes these inpossibles, and philosophy becomes the enterprise of describing, outside of the logic and vocabulary at hand, the universe of living paradoxes." (Course 10, p. 182) — the first technical introduction of Ineinander in MP's published writing.

"The historicity of an idea summons up the whole past and the entire future of culture as its witness. And to call upon so much history it has no need of documents, for history has its anchorage within itself, in the flesh of its sensible or natural existence, its active and productive being." (Course 11, p. 190) — "flesh" used in 1959-60 for the historicity of ideas, before V&I.

"The only way to grasp an idea is to produce it." (Course 11, p. 189, citing Husserl) — the Origin-of-Geometry thesis.

"The earth where we live, that which is this side of rest and movement, being the ground from which all rest and all movement are separated, which is not made out of Körper, being the 'source' from which they are drawn through division, which has no 'place,' being that which surrounds all place, which lifts all particular beings out of nothingness, as Noah's Ark preserved the living creatures from the Flood. There is a kinship between the being of the earth and that of my body (Leib) which it would not be exact for me to speak of as moving since my body is always at the same distance from me." (Course 11, p. 195) — Earth as Boden; the primary anchor for precession and the kinship of earth, Leib, other bodies.

"The body proper is a sensible and it is the 'sensing'; it can be seen and it can see itself; it can be touched and it can touch itself, and, in this latter respect, it comprises an aspect inaccessible to others, open in principle only to itself. The body proper embraces a philosophy of the flesh as the visibility of the invisible." (Course 12, p. 202) — the most compact statement of flesh-as-visibility-of-invisible; earlier than the V&I chapter that deploys it.

"The unconscious is feeling itself, since feeling is not the intellectual possession of 'what' is felt, but a dispossession of ourselves in favor of it, an opening toward that which we do not have to think in order that we may recognize it." (Course 12, p. 203) — MP's reformulation of the Freudian unconscious.

"The primordial unconsciousness would be a permissive being, the initial yes, the undividedness of feeling." (Course 12, p. 204) — the "initial yes" formulation.

"The preceding leads to the idea of the human body as a natural symbolism; an idea, rather than being final, announced, on the contrary, a sequel." (Course 12, p. 204) — direct primary-text support for natural-symbolism in MP's own formulation.

What's Not Obvious

Three things this volume contains that would not appear in a conventional summary:

MP criticizes Socrates on Socrates's own principles. Every commentator treats Socrates as a patron saint of philosophical courage. MP does the opposite: "Sometimes it is clear that he yields to the giddiness of insolence and spitefulness, to self-magnification and the aristocratic spirit" (IPoP §III, p. 45). When Socrates tells his judges he will continue philosophizing "even if I must die many times", MP reads this as bad irony — Socrates "is wrong on the basis of his own principles". This criticism matters because MP's account of irony in IPoP §III is precisely what connects to interrogation in Course 10: Socratic irony at its best is the non-coincident relation with others that philosophical interrogation requires. When Socrates falls into taunts and martyrdom-posturing, he betrays the irony he teaches. And MP wants us to see this because the criticism is the condition for a philosophical style that does not repeat Socrates' mistake — a style MP is trying to model in his own 1953 inaugural. The "limping philosophy" of §VI is the positive form of the irony §III describes; the taunts are its degeneration. This is not a summary point; it is internal to MP's self-presentation as philosopher.
The primary-text attestation of the "barbaric principle" in MP's voice is 1956-57, not November 1960. The wiki's barbarian-principle page has been keyed to a November 1960 working note from V&I. But Course 8 (1956-57), summarized here, contains the direct citation: Schelling's erste Natur is "an ambiguous principle, or, as he puts it, a 'barbarous' principle which can be transcended, but will never be as though it had never existed, and can never be considered secondary even in relation to God" (pp. 148-9). This is three to four years earlier, and unlike the working note it appears in a published text that MP himself prepared for publication. The genealogical implication: the barbaric principle is not a late discovery forced on MP by the V&I project; it has been a live conceptual presence in his teaching since the first nature course. MP's turn to Schelling was slower and more thorough than the working-note evidence suggests.
MP's concept of institution (Course 5) arrives at a critique of reflective philosophy by a completely different route than V&I. The V&I critique of philosophy of reflection proceeds via a genealogical/phenomenological argument: reflection cannot catch up with its own operative intentionality; it always arrives too late. Course 5 arrives at the same destination via the problem of personal and public history. For a constituting consciousness "there is nothing in the objects capable of throwing consciousness back toward other perspectives"; the self's relation to its own past "yields... by means of a series of fragmentations". Institution breaks this impasse by giving the subject a past that is the "field of my becoming" rather than a reconstituted object. The Course-5 critique is significant because it shows that MP's late-ontology commitments can be motivated from a different starting point — not the chiasm of perception but the shape of historical becoming. The current wiki page philosophy-of-reflection only traces the V&I route; adding Course 5 reveals that the critique has two legs that meet in the same conclusion.

Critique / Limitations

These are course summaries, not polished arguments. MP wrote them for the Collège administration as end-of-year reports. They are dense, abbreviated, and sometimes cryptic — especially in the nature courses where a year of lectures is compressed to ~10 pages.
The summaries do not give the full arguments — only the conclusions and the argumentative shape. Where MP cites a biological or physical result, he typically does not reconstruct the research in detail. The reader must trust that MP's summary of, e.g., Uexküll or Driesch is faithful.
IPoP itself (Part 1) is an inaugural lecture — a genre with its own constraints. It is more rhetorical and political than the scholarly work. The readings of Lavelle and Bergson are brilliant but also selective (MP makes Lavelle more congenial than he is).
MP's engagement with Marx (Course 4 and IPoP §V) is generous to Marx but polemical against "the followers of Marx". The reading is idealized — Marx did not in fact consistently refuse a "dialectic of matter" in the way MP suggests.
The lectures on physics and biology (Courses 8-9) treat scientific research with philosophical eagerness that sometimes outruns the science itself. MP's reading of wave mechanics and relativity is a philosophical reading; it should not be mistaken for a scientific interpretation.
The volume does not contain material from MP's final two course years (1959-60, 1960-61), which are the most developed form of his late ontology; for those, consult merleau-ponty-2022-possibility-of-philosophy.

Connections

companion to merleau-ponty-2022-possibility-of-philosophy — the 2022 volume contains MP's exploratory working notes for 1959-1961; this volume contains his end-of-year summaries for 1952-1960. They overlap in the 1959-60 courses (Nature and Logos; Husserl at the Limits) but the genres differ.
precedes merleau-ponty-1968-visible-and-invisible — the courses develop concepts that V&I will deploy: interrogation, ineinander, natural-symbolism, "flesh as visibility of the invisible".
develops through henri-bergson — IPoP §II is MP's most sustained reading of Bergson; the Bergson of "expression" is MP's own creation from Bergson's texts.
engages edmund-husserl — Courses 8, 10, 11 give the three-stage reading of the late Husserl (Ideen II / Lebenswelt / Origin of Geometry + Umsturz).
engages martin-heidegger — Course 10 is MP's most direct published defense of Heidegger against three popular misreadings (negativism, anthropology, metaphysical resumption).
engages friedrich-schelling — Course 8 contains the in-text attestation of the barbaric principle.
critiques Hegel's absolute knowledge — IPoP §V, Course 7.
critiques Cartesian mechanism — Course 8.
critiques Kantian humanism — Course 8.
extends Saussurean linguistics to history and institutions — IPoP §V, Course 3.
builds on Gestalt psychology (Wertheimer) and body-schema research (Head) — Course 1.

Sources

(No sources — this is a primary source.)