 With the first clause of PIJ, one can present a relatively straightforward epistemic regress argument for foundationalism. That clause basically says that one cannot acquire justification for a belief by inferring it from an unjustified belief. It also seems that one cannot acquire justification for a belief by way of a circular, inferential justification—one cannot rely even in part on a proposition as a premise in an inference in support of that very proposition. We seem left with two options: allow that some beliefs have justification without depending on other beliefs, or suppose that all justification is inferential. If all justification is inferential, then for someone S to be justified in believing some proposition P, S must be in a position to legitimately infer it from some other proposition E1. But E1 could justify S in believing P only if S were justified in believing E1, and if all justification were inferential, S would have to infer it (or at least be able to infer it) from some other proposition justifiably believed, E2, a proposition which in turn would have to be inferred from some other proposition justifiably believed, E3, and so on, ad infinitum. But finite beings cannot complete an infinitely long chain of reasoning. And so, if all justification were inferential, no one could be justified in believing anything at all to any extent whatsoever.