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We cognize objects only as appearances, never as things in themselves

The passage

We can have cognition of no object as a thing in itself, but only insofar as it is an object of sensible intuition, that is, as appearance.

folglich wir von keinem Gegenstande als Dinge an sich selbst, sondern nur so fern es Object der sinnlichen Anschauung ist, d. i. als Erscheinung, Erkenntniß haben können

consequently that we can have cognition of no object as a thing in itself, but only insofar as it is an object of sensible intuition, that is, as appearance

Kritik der reinen Vernunft B xxvi–xxvii (AA 3:16.30–17.07)

Stated in the preface to the second edition as what the analytical part of the Critique proves (B xxvi, AA 3:16.34–37). The preface presents it as a result; the proof it refers to is not formalized here.

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