Now, however, all experience contains in addition to the intuition of the senses, through which something is given, a concept of an object that is given in intuition, or appears; I hence concepts of objects in general lie at the ground of all experiential cognition as a priori conditions; consequently the objective validity of the categories, as a priori concepts, rests on the fact that through them alone is experience possible (as far as the form of thinking is concerned).