Volume IV contains works discussing character and virtues, finishing with Plato's The Laws, a guide on how to properly live as a citizen in any society. Also included in Volume IV: Charmides, Lysis, Laches, Protagoras, Ion, Sophist, and Statesman, among others.
One of the greatest Western philosophers who ever lived, Plato (c. 428-347 B.C.) was a student of Socrates and teacher of Aristotle. Plato was greatly influenced by Socrates' teachings, often using him as a character in scripts and plays (Socratic dialogues), which he used to demonstrate philosophical ideas. Plato's dialogues were and still are used to teach a wide range of subjects, including politics, mathematics, rhetoric, logic, and, naturally, philosophy.