 It seems, to be sure, that this contradicts all remarks that have always been made concerning the course of the employment of our understanding, according to which we have only been first guided by the perception and comparison of many concurring sequences of events following on certain appearances to discover a rule, in accordance with which certain events always follow on certain appearances, and we have thereby been first prompted to make for ourselves the concept of cause. On such a basis this concept would be merely empirical, and the rule it supplies, that everything that happens has a cause, would be just as contingent as experience itself: its universality and necessity would then be only feigned and would have no true universal validity, because they would not be grounded a priori but only on induction.