 Mill offers two answers to this question. The first, we might term his iterative validation of induction. We are warranted in believing enumerative inductions, Mill thinks, because “[t]he universe, so far as known to us, is so constituted, that whatever is true in any one case, is true in all cases of a certain description” (System, VII: 306). This uniformity of nature, however, is something we do not, and could not, know a priori, but only itself as “as an instance of induction” (System, VII: 307). We know, in other words, by an act of induction, that inductive generalizations tend to be true, and that induction is therefore a good way of reasoning. Induction is, in this sense, self-supporting.