For plato, the forms are the metaphysical foundation of reality, which means that knowledge of reality is grounded in knowledge of the forms.
Plato's view that truth is a (atypical and non-relational) substantive property of propositions is supported by his realism of existence. Identifying and understanding the metaphysical basis of truth, as Plato saw it, is the main concern of Hestyl's book.
According to Platonist ontology, forms are fundamental beings, and forms are always the same in the same respects. Thy cannot be used in combination with other forms. Restricted Platonism, on the other hand, assumes the following form (currently lowercase "f"): always the same in at least one respect, but not in all respects. Essential in at least one respect, but not in all respects. Such beings must be connected with other forms.
Plato is said to replace isolated, "pure" and powerful Platonic forms with interactive beings that, if not stable in all respects, can remain stable and connect to each other, at least for what they are.
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