Plutarch in On Tranquillity of Mind discusses a way to use the famous phrase Know Thyself.
Some Figures mentioned:
Sertorius Eumenes, Philip II of Macedon Alexander the Great Dionysius I, Tyrant of Syracuse Philoxenus the Poet Pindar Empedocles Plato Democritus Ismenias, wealthy citizen of Thebes Epaminondas, Theban general Euripides