There is no peeping out. What would lie in the beyond makes its appearance only in the materials and categories within. This is where the truth and the untruth of Kantian philosophy divide. It is true in destroying the illusion of an immediate knowledge of the Absolute; it is untrue in describing this Absolute by a model that would correspond to an immediate consciousness, even if that consciousness were the intellectus archetypus. To demonstrate this untruth is the truth of post-Kantian idealism; yet this in turn is untrue in its equation of subjectively mediated truth with the subject-in-itself--as if the pure concept of the subject were the same as Being.

Adorno, Negative Dialectics