In my recent post on Kant’s idealism, I noted that part of Kant’s strategy was to give a critique of our powers of cognition so as to identify the conditions for epistemic access to appearances. According to Hegel, insofar as this critique must be prior to the exercise of cognition, so as to determine how our cognitive capacities are to be applied (e.g. only to sensible objects, conforming to the forms of intuition and a fixed set of general conceptual categories) then he thinks Kant has got himself in a bind. With somewhat uncharacteristic perspicuity, Hegel sets out his objection like so:
A very important step was undoubtedly made, when the terms of the old metaphysic were subjected to scrutiny. The plain thinker pursued his unsuspecting way in those categories which had offered themselves naturally. It never occurred to him to ask to what extent these categories had a value and authority of their own. If, as has been said, it is characteristic of free thought to allow no assumptions to pass unquestioned, the old metaphysicians were not free thinkers. They accepted their categories as they were, without further trouble, as an a priori datum, not yet tested by reflection. The Critical philosophy reversed this. Kant undertook to examine how far the forms of thought were capable of leading to the knowledge of truth. In particular he demanded a criticism of the faculty of cognition as preliminary to its exercise. That is a fair demand, if it mean that even the forms of thought must be made an object of investigation. Unfortunately there soon creeps in the misconception of already knowing before you know — the error of refusing to enter the water until you have learnt to swim. True, indeed, the forms of thought should be subjected to a scrutiny before they are used: yet what is this scrutiny but ipso facto a cognition?
Hegel, Shorter Logic, s.41