HIPPARCHUS or PHILOKERDES: Socrates discusses with an anonymous friend about the concept of avarice and who is an avaricious person. It is likely a spurious work.

THEAGES or ON PHILOSOPHY: The discussion about the education that a young person can receive near the sophists turns into a discourse on Socrates' daimonion. The authenticity of the work is disputed.

CHARMIDES or ON SOPHROSYNE: Socrates recounts to his friends the discussion he had with Charmides regarding sophrosyne, one of the main virtues. The unity of virtues. Philosophy and the youth. The knowledge of good and evil as a prerequisite for true happiness and success.

Plato was born in 427 BC, of a prominent Athenian family. He received an excellent education and was acquainted with Greek philosophical currents. However, what fundamentally shaped his moral and spiritual being was Socrates, with his life, philosophy, and death.

The great philosopher was the reason the young Plato turned to philosophy, and the Socratic terminology became the basis for the later development of the Platonic Theory of Ideas. Plato profoundly interpreted Socrates as a man and teacher, capturing his personality in many of his works.

He traveled to Egypt, Cyrene, and Greater Greece, where he unsuccessfully attempted to apply his political principles in the organization of the Greek cities of Sicily. In 387 BC, he founded the Academy in Athens, a renowned center of philosophy and the Muses, which lasted almost ten centuries, until the times of Justinian.

Plato devoted himself to teaching and writing until his death (348 BC). All of his surviving works were classified by Thrasyllus into nine tetralogies. Almost all of them belong to the genre of dialogue, with which Plato emerged not only as a leading philosopher but also as a true poet.

His teaching derives from the doctrines of Greek thought, Orphism, Pythagoreanism, and Ionian philosophy, and of course from the Socratic discourse, ultimately shaping into a colossal philosophical system as his personal creation.

His philosophy - moral, ontological, political - is the foundation of global Idealism and perhaps influenced the thought of all ages more than anyone else.