This book provides a comprehensive commentary of the Philebus designed to shed light on the nature and function of the good in Plato’s philosophy as a whole. Topics discussed include dialectic, pleasure, epistemology, and the relations between metaphysics and ethics.

Author Ken Dorter, in a passage-by-passage analysis traces Plato's depiction of how the most basic forms of human functioning and social justice contain the seed of their evolution into increasingly complex structures, as well as the seed of their degeneration. Dorter also traces Plato's tendency to begin an investigation with models based on rigid distinctions for the sake of clarity, which are subsequently transformed into more fluid conceptions that no longer sacrifice complexity and subtlety for clarity.

This is the first edition of Plato's Republic to be based on an exhaustive examination of all the textual evidence - manuscripts, including papyri; quotations and allusions in ancient authors; translations into Coptic, Arabic and Hebrew. The three primary manuscripts have been examined with particular care. Many new readings have been introduced in the text and a critical apparatus gives details for all relevant textual evidence.