1. Plato

15. “Becoming” is by us incorrectly called being, but is really becoming, for nothing ever is, but all things are becoming. Summon all philosophers- Protagoras, Heraclitus, Empedocles, and the rest of them, one after another, and with the exception of Parmenides they will agree with you in this. Plato, Theaetetus

17. Do we say that there is such a thing as the Just itself, or not? We do say so, by Zeus. And the Beautiful, and the Good? Of course. And have you ever seen any of these things with your eyes? In no way, he said. Or have you ever grasped them with any of your bodily senses?... [Or do you instead do so] by using pure thought alone?

18. Platonic Forms are: i.imperceptible, ii.eternal, iii.unchanging, iv.indivisible, and v.ultimately real.

19. Well then, consider what then follows if you also accept my hypothesis. For it seems to me that if anything else is beautiful besides Beauty Itself, it is beautiful on account of nothing else than because it partakes of Beauty Itself. And I speak in the same way about everything else. Plato, Phaedo

23. We are in the habit, I take it, of positing a single idea or form in the case of the various multiplicities to which we give the same name. Do you understand? I do. In the present case, then, let us take any multiplicity you please; for example, there are many couches and tables. Of course. But these utensils imply, I suppose, only two ideas or forms, one of a couch and one of a table. Plato, Republic Book 10

24. The One over Many Argument 1.There are many tables. 2.If (1), then there is some thing those many tables share. 3.If there is some thing those many tables share, then there are Forms. 4.There are Forms.