Philebus

thumb|The beginning of Philebus in the oldest surviving medieval manuscript, the Codex Clarkianus written in 895 (Oxford, Bodleian Library, Clarke 39) The Philebus (, ) is a work by the ancient Greek philosopher Plato, written in dialogue form. It presents a fictional conversation between Plato's teacher Socrates and two young Athenians, Philebus and Protarchus. The main topic is the ethical evaluation of pleasure.

Philebus and Protarchus are hedonists; they consider pleasure as the highest good and equate it with the absolute Good. Socrates represents the opposing view, prioritizing reason and insight. While he does not dispute the legitimacy and value of pleasure, he points out the diversity of pleasures and argues for a more nuanced assessment. He rejects some forms of pleasure as harmful and assigns a subordinate rank in the hierarchical value order to the remaining "pure" pleasures. The distinction between types of pleasure leads to general considerations about the unity and plurality of types that are subsumed under a generic term, and about the categories into which all being can be divided. Socrates explores the causes, origins, and characteristics of various forms and mixtures of pleasure and pain that occur in human life and their changing combinations, which result in diverse emotional states. The specifics of each form of pleasure are analyzed, and the reasons for their varying evaluations are explained. At the end of the dialogue, Socrates presents a universal value order. In this, proper measure, proportionality, takes the highest place, and pleasure – as far as it is justified – takes the lowest. Harmful pleasures are to be avoided. The right mixture of desired factors is supposed to enable a successful life and bring about a balanced emotional state. Protarchus agrees, while Philebus no longer comments.