  Throughout the dialogues, Forms are said to be one, hen, or monoeides. (See especially the Affinity Argument in the Phaedo, 78b-84b.) These passages suggest that the self-predicational nature of Forms implies that the only property predicable of a Form is itself: i.e., Justice is just and the only thing Justice is is just. (There are epistemological reasons that support this reading: See §11 infra.) But other passages suggest that Forms cannot be simple in this strict sense. From the Republic we know that all Forms are related to the Good. While it is difficult to be certain, Plato seems committed to the claim that each Form is good, that is, that each Form is a good thing or is characterized by  goodness.[8]