Kant agrees with Hume that knowledge rests on experience. But he rejects the notion that concepts, such as cause, are only psychological. Kant returns to Aristotle’s ideas of the categories and the distinction between a priori and a posteriori knowledge. A priori knowledge is prior to and does not depend on experience; a posteriori comes after and does rely on it. Kant argues that it is impossible to know anything a priori about the world as it is, independently of our cognitive apparatus.
