 It can now be seen how common cognition is distinguished from the cognition of a philosopher, namely, one who has no understanding of philosophy can learn many things about what is possible from experience, yet, he will not know how to indicate the reason why it [i.e., that which he learns from experience] can be. For instance, he learns from experience that it can rain, but cannot say how it happens […] nor indicate the causes why it rains. (GL: Preface, §6)