 I thus first tried whether Hume’s objection might not be represented generally, and I soon found that the concept of the connection of cause and effect is far from being the only one by which the understanding thinks connections of things a priori; rather, metaphysics consists wholly and completely of them. I sought to secure their number, and since this succeeded as desired, namely, from a single principle, I then proceeded to the deduction of these concepts, on the basis of which I was now assured that they are not derived from experience, as Hume had feared, but have sprung from the pure understanding. 