  This is a significant result, for two reasons. First, it reinforces the earlier result obtained from the conjunction of D1, D2, and D5 (and from the conjunction of D3, D4, and D5), namely that Purity-F is false. For D1 and D2 (as well as D3 and D4) together entail that if the one is, then Purity-F is false. But D6 establishes that the one is. It then follows directly by modus ponens that Purity-F is false. Second, the result that the one is can be generalized to establish the being of any form whatever. The reason is that none of the reasoning in the Deductions up to this point depends on the one’s having been chosen as the main subject of the Deductions. Every Argument of D1–D6 would go through if some other form were substituted for the one as the main topic of discussion. Earlier, Parmenides had said that “only a very gifted man can come to know that for each thing there is some kind, a being itself by itself” (135a–b). So he has now revealed himself to be the “very gifted man” of whom he had spoken.