Franz Brentano

Austrian philosopher (1838–1917), Catholic priest (laicized 1873), professor at Würzburg and Vienna. Best known to the wiki as the author of the 1862 dissertation Von der mannigfachen Bedeutung des Seienden nach Aristoteles (Freiburg im Breisgau: Herder, 1862) — the work that, by Heidegger's own autobiographical testimony, was the erste Anstoß (first impulse) of the entire Heideggerian Seinsfrage. Brentano is also widely recognized as the teacher of Husserl, Twardowski, Meinong, Marty, Stumpf, and others — the founder of the Brentano school and the originator (or re-originator, from Scholastic sources) of the modern concept of intentionality.

On the wiki: Brentano enters principally via Heidegger's autobiographical statements in the 1963 *Mein Weg in die Phänomenologie* essay and the 1968 *Über das Zeitverständnis* essay (both in Zur Sache des Denkens, GA 14), and — since the 2026-07-21 ingest of *Logical Investigations* Vol. I — directly through Husserl's own text.

Dating guard (LI Vol. I ingest; specified at the Vol. II ingest, 2026-07-21). The relation "Husserl's LU developed Brentano's intentionality-thesis and descriptive-psychology method" is true of Volume II (esp. Investigations V–VI) — not of Volume I. The Prolegomena is the anti-psychologistic polemic, at critical distance from all empirical-descriptive psychology, and develops no intentionality doctrine; its one substantive Brentano-engagement is the Introduction's caution that Brentano's logic-reform exemplifies "a dangerous radicalism" (Inv. Intro §4); in Investigation I Husserl adopts Brentano's term "motivation" against Meinong's censure. With Volume II now ingested, the "development" is specifiable as a two-step transformation (Inv V): (i) Husserl refutes the natural reading of Brentano's principle — a percept is not perceptual-presentation + belief (§27's waxworks analysis), judgement is not presentation + a "deciding note" (§28), assent is a fulfilment-transition (§29), and the principle's self-evidence rested on the equivocation of "presentation" (§32); (ii) he re-establishes it under a new concept — "Each intentional experience is either an objectifying act or has its basis in such an act" (§41), the nominal reading demoted to "secondary consequence" (§43). What is kept from the 1874 Psychologie: directedness as the descriptive mark of a fundamental act-class ("The value of Brentano's conception… is quite independent of the aims that inspired it," §9) and the founded-act structure of feelings (§15). What is purged: the psychical/physical phenomena classification (§9); the "intentional (or mental) inexistence" / "immanent objectivity" gloss — directedness without an in-dwelling object ("only one thing is present, the intentional experience," §11); and the inner-perception evidence-doctrine (below). Heidegger's Zwiespältigkeit (Vol. I refutes psychologism / Vol. II describes acts) is exactly this tension — and Inv V §27 shows how Husserl holds the two: phenomenological assertions are grounded "only in ideational, phenomenological inspection of essence," never in existence-positing "internal perception… psychological experience." Both poles are now primary text.

The Appendix's direct critique (Vol. II). "External and Internal Perception: Physical and Psychical Phenomena" reconstructs Brentano admiringly ("thinkers I value so highly") and dismantles both doctrines: (a) inner and outer perception, "if the terms are naturally interpreted… are of an entirely similar epistemological character" — most inner perception is transcendent and fallible ("the pain appears to bore a sound tooth"); (b) the physical/psychical division "confuses two essentially different types of psychological division" — experiences into acts/non-acts vs. phenomenal objects into physical/psychical — and the intentional-inexistence existence-criterion collapses on the Böcklin case (sensed colour-contents are reelle, actual constituents; the pictured Elysian Fields need not exist at all); (c) the epistemologically fundamental contrast is adequate vs. inadequate perception, which "intersects… and therefore pervades" the inner sphere — evidence relocated from a perception-direction to a givenness-mode. See intentionality, evidenz.

Key Points

  • The 1862 dissertation as Stab und Stecken of Heidegger's first philosophical orientation. Per the 1963 essay (GA 14 p. 92): "Dessen Dissertation »Von der mannigfachen Bedeutung des Seienden nach Aristoteles« (1862) war jedoch seit 1907 Stab und Stecken meiner ersten unbeholfenen Versuche, in die Philosophie einzudringen." Heidegger encountered the dissertation in 1907 (last Gymnasial year, age 18); it remained his primary guide through the pre-Husserlian years.
  • The seed-question: Brentano's dissertation poses the Aristotelian question of the mannigfache Bedeutung des Seienden (manifold meaning of being) — the question that comes from Aristotle's Metaphysics Γ.2 (1003a33: τὸ ὂν λέγεται πολλαχῶς). Heidegger's distillation of the question (GA 14 p. 92): "Unbestimmt genug bewegte mich die Überlegung: Wenn das Seiende in mannigfacher Bedeutung gesagt wird, welches ist dann die leitende Grundbedeutung? Was heißt Sein?" This is the seed of the entire Heideggerian Seinsfrage.
  • Brentano as the Husserl-influence-source: per the 1963 essay (GA 14 p. 92): "Aus manchen Hinweisen in philosophischen Zeitschriften hatte ich erfahren, daß Husserls Denkweise durch Franz Brentano bestimmt sei." The young Heidegger took up Husserl's Logische Untersuchungen because of the Brentano-link — i.e., to find a path toward the Brentano-Aristoteles question via Husserl's phenomenology.
  • Intentionality as Brentano-inheritance into Husserl: Husserl's foundational concept of intentionality (Gerichtetheit auf etwas) was inherited from Brentano (Brentano's distinction between physical and psychic phenomena, with intentionality as the mark of the psychic; Psychologie vom empirischen Standpunkte, 1874). Heidegger's 1928 Vorbemerkung zu Husserls Vorlesungen zur Phänomenologie des inneren Zeitbewußtseins (in Zur Sache des Denkens) notes: "Auch heute noch ist dieser Ausdruck [Intentionalität] kein Lösungswort, sondern der Titel eines zentralen Problems."
  • The Aristotelian filiation: Brentano's Aristotelianism (Scholastic-Catholic, mediated through Thomas) was the nineteenth-century re-emergence of Aristotle as a philosophical (not merely historical) author. The dissertation traces the categorial-distinction of ens in Metaphysics Δ.7 and Categories, and gives a developed philosophical treatment of ousia / dynamis / energeia. This is what Heidegger was reading at age 18.

Argumentative Role in Heidegger's Late Autobiography

The 1963 and 1968 essays converge on a single autobiographical-genealogical narrative:

  1. Brentano-Aristoteles 1907 (Gymnasial encounter): the seed-question of the Seinsfrage.
  2. Husserl-LU 1909+ (Theological Faculty Freiburg): taken up as a path toward the Brentano-induced question.
  3. Husserl-LU-Zwiespältigkeit 1909–13 (the pre-Ideen frustration): Heidegger rat- und weglos on Husserl's apparent self-contradiction (LU Bd. I refutes Psychologismus; LU Bd. II describes Bewußtseinsakte).
  4. Husserl-Ideen 1913: clarifies Husserl's project as transzendentale Phänomenologie.
  5. Husserl-Werkstatt 1916+ (Freiburg arrival): phenomenological Sehen trained in Husserl's Werkstatt; concurrent Aristotle-Auslegung (the two mutually feed).
  6. 1922 LU-Arbeitsgemeinschaft Aletheia-Insight: Aletheia is the ursprünglichere Greek name for what LU-Phänomenologie names Sich-Bekunden der Phänomene. So wurde ich auf den Weg der Seinsfrage gebracht, erleuchtet durch die phänomenologische Haltung, erneut und anders als zuvor durch die Fragen beunruhigt, die von Brentanos Dissertation ausgingen (GA 14 p. 97).

The cardinal autobiographical claim: Brentano-Aristoteles is primary; Husserl-LU is secondary (a path toward the Brentano-question, not the source of the question). Cross-confirmed by the 1962 Richardson-Brief (GA 11): Brentano's dissertation is the erste Anstoß (first impetus) of Heidegger's thinking. The 1968 Über das Zeitverständnis repeats the chain compactly: Brentano-Aristoteles → Aletheia-Anwesenheit → Zeit-als-Sinn-von-Sein.

Cross-Corpus Pointers

  • Brentano, Von der mannigfachen Bedeutung des Seienden nach Aristoteles (Freiburg im Breisgau: Herder, 1862; dissertation, Tübingen). The primary text. Not in wiki raw/.
  • Brentano, Psychologie vom empirischen Standpunkte (Leipzig: Duncker & Humblot, 1874). The intentionality-thesis. Not in wiki raw/.
  • Husserl, Logische Untersuchungen (Halle a. d. S.: Niemeyer, 1900-01). The work that mediated Brentano's influence into the phenomenological school. Both English volumes now in the wiki as primary sources: husserl-1900-logical-investigations-vol1 and husserl-1901-logical-investigations-vol2 (both ingested 2026-07-21).
  • The Richardson-Brief (1962, in Richardson, Heidegger. Der Weg von der Phänomenologie zum Seinsdenken, Den Haag: Nijhoff, 1963; also GA 11 p. 143 ff.): Heidegger's most concentrated autobiographical statement on the Brentano-Anstoß, sent as foreword to Richardson's monograph. Read aloud at the closing of the Todtnauberg Seminar Session 5 (Protokoll p. 57). Ingested at heidegger-ga11-identitat-und-differenz (raw I&D 2318–2336); the earlier "not in wiki raw/" note was stale since the GA 11 ingest.

Connections

  • is the source of Heidegger's erste Anstoß (first impulse) for the Seinsfrage. Per 1963 Mein Weg in die Phänomenologie and 1968 Über das Zeitverständnis. The cardinal autobiographical anchor.
  • was the teacher of Husserl — Husserl's Logische Untersuchungen developed Brentano's intentionality-thesis and the descriptive-psychology method in Volume II; Volume I (the *Prolegomena*) is the anti-psychologistic polemic that keeps its distance (see the dating guard above).
  • originated (or re-originated) the modern concept of intentionality (from Scholastic sources, esp. Thomas). Heidegger's 1928 Vorbemerkung: intentionality is kein Lösungswort, sondern der Titel eines zentralen Problems.
  • initiated the Aristotle-renaissance that grounds twentieth-century phenomenology — the mannigfache Bedeutung des Seienden as the seed-question of post-Hegelian ontology.

Open Questions

  • What is the Brentano school connection to the wiki's other entities? Husserl, Twardowski, Meinong, Marty, Stumpf, and others were direct students. Since the 2026-07-21 Vol. II ingest, carl-stumpf (the Inv III interlocutor and LI dedicatee) and kazimierz-twardowski (the recurring content/object foil) have dedicated pages; Meinong and Marty remain without pages (Marty's role is concentrated in Investigation IV — see pure-grammar).
  • How does Brentano's empirical psychology relate to Husserl's Logische Untersuchungen Bd. II? (Answered by the 2026-07-21 Vol. II ingest — see the "Appendix's direct critique" section above: method inherited, inner-perception evidence-doctrine and phenomenon-classification refuted; the descriptive stance is re-grounded in ideation, not inner perception, at Inv V §27.) What remains open is the counterfactual half: whether Brentano himself would have endorsed the transcendental turn the 1913 Ideen used to resolve the Zwiespältigkeit.
  • Did Brentano's dissertation influence Heidegger philologically or systematically? Heidegger's 1907 encounter was as a Gymnasium student; the dissertation's philological-Aristotelian content (the categorial-distinction of ens) is what shaped his initial orientation. The systematic uptake (the Was heißt Sein? question) is Heidegger's own — Brentano did not pose the Was heißt Sein? question; he traced how Sein is said in multiple ways. The systematic transformation is Heideggerian.

Synthetic Claims

The synthetic interpretive layer (wiki/claims.md) articulates claims for which this page is a Wiki home. Live claims are cited with provisional framing per CLAUDE.md §Claims Register Format.

  • supported claim, see claims#brentano-as-erste-anstoss-of-seinsfrage — the claim names Brentano's 1862 dissertation as the primary Anstoß (first impulse) of Heidegger's Seinsfrage, with Husserl's LU as secondary; three-way cross-confirmation (1963 Mein Weg, 1962 Richardson-Brief, 1968 Über das Zeitverständnis).

Sources

  • heidegger-1963-mein-weg-in-die-phaenomenologie — cardinal autobiographical anchor. Brentano-dissertation as Stab und Stecken seit 1907 (GA 14 p. 92); Husserl-LU encountered because of the Brentano-link (p. 92); the 1922 Aletheia-Insight brings Heidegger erneut und anders als zuvor on den Weg der Seinsfrage via the Brentano-questions (p. 97).
  • heidegger-1968-zeitverstaendnis-in-der-phaenomenologie — repeats the chain compactly: Brentano-Aristoteles → Aletheia-Anwesenheit → Zeit-als-Sinn-von-Sein (GA 14 pp. 147–148).
  • husserl-1901-logical-investigations-vol2 — the primary text of the transformation: Inv V §§9–11, 15 (what is kept and purged of the 1874 intentionality-thesis), §§22–45 (the principle refuted-as-read and re-established as the objectifying-act doctrine), §27 (ideation vs. internal perception); Appendix §§1–8 (the direct critique: adequate/inadequate replaces inner/outer; the classification confusion; the Böcklin case). Extraction note D3.8–D3.10, D4.1–D4.19, D6.24–D6.28.
  • Cross-corpus pointers: Brentano, Von der mannigfachen Bedeutung des Seienden nach Aristoteles (1862); Brentano, Psychologie vom empirischen Standpunkte (1874); Richardson-Brief (1962, in Richardson 1963 / GA 11).