 For Kant, the concept of cause cannot possibly arise from a mere repetition of resembling constant conjunctions (“concurring sequences of events following on certain appearances”) producing a merely subjective  custom.[48]  The procedure by which we apply the concept of cause to experience cannot be merely inductive in the Humean sense; it must rather involve a priori rules of the understanding through which we progressively determine the objective causal relations between appearances—and thereby determine the objective order of succession in time  itself.[49]