Leitfrage and Grundfrage

Heidegger's architectonic distinction between two questions of philosophy. The Leitfrage (guiding question) is "Was ist das Seiende?" — "What is the being?" — i.e., what makes a being a being? This question, given its decisive form by Aristotle (Metaphysics Z 1: τί τὸ ὄν; "what is the being?"), guides all Western metaphysics from the Pre-Socratics through Plato, Aristotle, the medievals, Descartes, Kant, Hegel, to Nietzsche. The Grundfrage (grounding question) is "Was ist das Sein selbst?" — "What is Being itself?" — or, more precisely, the question of the truth of Being. The Grundfrage grounds the Leitfrage; it is the question whose unfolding opens the space within which the Leitfrage is asked. The decisive thesis of *Nietzsche I*: the Grundfrage has never been unfolded (entfaltet) in Western metaphysics. To unfold it would be to step into the other beginning of thinking — to leave metaphysics behind. Nietzsche, the letzter Metaphysiker, brings the Leitfrage to its uttermost extremity, and the Vollendung of the Leitfrage opens the Not (need) for the Grundfrage.

What the Concept Does

  1. Articulates the architectonic of Western metaphysics. Every position within Western philosophy (Plato's ideas, Aristotle's ousia, the medieval ens commune, the Cartesian res cogitans/extensa, the Kantian categories, the Hegelian Spirit, the Nietzschean will to power) is an answer to the Leitfrage. The Leitfrage itself is presupposed, not asked.

  2. Names what is unasked. The Grundfrage is not a question that gets a different answer than the Leitfrage; it is a question that has never been posed in metaphysics. To pose it is to step into the anderer Anfang (other beginning).

  3. Provides the criterion for Heidegger's reading of Nietzsche. Nietzsche's Wille zur Macht and ewige Wiederkehr answer the Leitfrage (basic character of beings + Being of beings as a whole). They do not ask the Grundfrage. This is the structural reason Nietzsche is the Vollender (completer) of metaphysics: he answers the Leitfrage at its extremity but leaves the Grundfrage unasked.

  4. Reframes the Versäumnis (omission) Nietzsche shares with all Western metaphysics. Nietzsche's failure to ask the Wesen der Wahrheit is not Nietzsche's personal failing; it is the structural omission of the Leitfrage-tradition since Plato. The Grundfrage names what gets omitted.

What It Rejects

  • Doxographic histories of metaphysics that treat positions as competing answers without recognizing that they all answer the same question (the Leitfrage). The Leitfrage/Grundfrage distinction shows that the doxographic differences are surface differences within an underlying unity.
  • The view that metaphysics has asked the question of Being. Metaphysics has asked "What is the being?" — the Leitfrage — but this is not the question of Being itself. Equating them would be precisely to miss the Grundfrage.
  • Reading Nietzsche-as-overcoming-of-metaphysics. Nietzsche stays within the Leitfrage. Overcoming metaphysics would require unfolding the Grundfrage, which Nietzsche does not do.
  • The view that the Grundfrage has an answer waiting to be found. Heidegger's claim is more radical: the Grundfrage has not been unfolded. Unfolding (entfalten) is itself the Grundfrage — it is not a question with a content waiting beneath it.

Stakes

  • For reading Nietzsche: places Nietzsche structurally rather than doxographically. He is not pluralist-vs-monist, atheist-vs-theist, naturalist-vs-supernaturalist, but: the most extreme answerer-of-the-Leitfrage.
  • For history of philosophy: history of philosophy is not a doxographic survey but a Geschichte des Seins (history of Being) in which each age has a metaphysical Grundstellung within the Leitfrage. The Grundfrage names what each age leaves unasked.
  • For Heidegger's own project: Sein und Zeit (1927) is positioned as preparing the Grundfrage — though Heidegger himself later acknowledges that Sein und Zeit still operates within Leitfrage-vocabulary (Dasein, existential analytic). Beiträge zur Philosophie (1936-38) is the next attempt to unfold the Grundfrage.
  • For the anderer Anfang: the Ende of metaphysics is the Not of the Grundfrage. The Hölderlin verse closing the Nietzsche I lectures names this threshold.

Problem-Space

The Leitfrage/Grundfrage distinction articulates the recurring philosophical problem: how can a tradition have a foundational unspoken question that is invisible to it from within? Cognate articulations:

  • Wittgenstein's "the unsaid" / the limits of language as the limits of the world.
  • Foucault's episteme — the unspoken structuring of what can be said in an age.
  • Derrida's différance — the trace that withdraws from any present that names it.
  • Cassirer's "symbolic forms" — the form of givenness that frames what is given.
  • MP's "perceptual faith" — the unspoken hold-on-the-world that makes thematic perception possible.

Relation to ontological difference

The Leitfrage/Grundfrage distinction is not identical to the ontological-difference (Sein vs. Seiendes) but is closely connected. The ontological difference is the content of what gets thought when the Grundfrage is unfolded; the Leitfrage/Grundfrage is the question-structure that distinguishes asking-after-beings from asking-after-Being. A complete account of Heidegger's thinking would unfold both: ontological difference as the what, Leitfrage/Grundfrage as the how-it-is-asked.

Connections

  • is the architectonic of heidegger-1961-nietzsche-i — the entire reading of Nietzsche depends on this distinction
  • grounds vollendung-der-metaphysik — Vollendung happens within the Leitfrage at its closing
  • is closely connected to ontological-difference — the difference between Sein and Seiendes is the content of what the Grundfrage thinks
  • is implied by seinsgeschichte — each metaphysical age has a Grundstellung within the Leitfrage; the Grundfrage names what each age omits
  • is the architectonic of metaphysische-grundstellung — a Grundstellung is a position within the Leitfrage
  • is the structural reason for Heidegger's reading of Nietzsche as letzter Metaphysiker (see friedrich-nietzsche §"Heidegger's Reading")
  • names what is unasked in the entire history from Plato through Nietzsche
  • is Heidegger's own technical name for a problem cognate to (but not identical with) Wittgenstein's, Foucault's, Derrida's articulations of the unsaid foundational

Open Questions

  • Is the Leitfrage/Grundfrage distinction an interpretive finding about Western metaphysics or a constructive imposition by Heidegger? Heidegger presents it as both (the distinction emerges from the unfolding, but the unfolding is itself Heidegger's act).
  • Does the distinction hold for non-Western philosophical traditions? Heidegger sometimes implies it does not — that the Grundfrage is uniquely Western — but the matter is contested in cross-cultural philosophy.
  • Has the Grundfrage been unfolded anywhere in Heidegger's own corpus, or is it forever a horizon-task? Heidegger's later Ereignis-thinking (Beiträge, Zeit und Sein) is the closest approximation.
  • Does the unfolding of the Grundfrage abolish metaphysics (in the sense of making the Leitfrage no longer interesting), or does it re-frame metaphysics?

Sources

  • heidegger-1961-nietzsche-i — II.21 ("Das Wesen einer metaphysischen Grundstellung. Ihre Möglichkeit in der Geschichte der abendländischen Philosophie") gives the most concentrated treatment (lines 3528-3608). The distinction is operative throughout the work; III.1 reactivates it in the form of "Nietzsche thinks the Vollendung."