This book by Plato examines the concept of the "good" and its role in the life of an individual. It looks at the various aspects of the good, including its moral, ethical, and metaphysical implications. Plato argues that the good is an essential part of human life and is the foundation
From Wikipedia
The Republic is a Socratic dialogue authored by Plato around 375 BC, concerning justice, the order and character of the just city-state, and the just man. It is Plato's best-known work, and one of the world's most influential works of philosophy and political theory, both intellectually and historically.