The noumenon as a limiting concept

Even if noumena are unknowable, they are still needed as a limiting concept, Kant tells us. Without them, there would be only phenomena, and since potentially we have complete knowledge of our phenomena, we would in a sense know everything. In his own words:

Further, the concept of a noumenon is necessary, to prevent sensible intuition from being extended to things in themselves, and thus to limit the objective validity of sensible knowledge.

What our understanding acquires through this concept of a noumenon, is a negative extension; that is to say, understanding is not limited through sensibility; on the contrary, it itself limits sensibility by applying the term noumena to things in themselves (things not regarded as appearances). But in so doing it at the same time sets limits to itself, recognising that it cannot know these noumena through any of the categories, and that it must therefore think them only under the title of an unknown something.

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