Socrates, appear for the first time in the middle works such as the Phaedo and the Republic.

As with all ancient ethical thinkers, Socrates thought that all human beings wanted eudaimonia more than anything else (see Plato, Apology 30b, Euthydemus 280d-282d, Meno 87d-89a). However, Socrates adopted a quite radical form of eudaimonism