_Protagoras_ makes Pleasure the only good, and Pain the only evil, and defines the science of good and evil as the comparison of pleasures and pains.

_Gorgias_ contradicts Protagoras, and sets up Order or Discipline as a final end.
_Politikus_ (on Government) repeats the Sokratic ideal of the One Wise man.

_Philebus_ makes Good a compound of Pleasure with Intelligence, the last predominating.

The _Republic_ assimilates Society to an Individual man, and defines Justice as the balance of the constituent parts of each.

_Timoeus_ repeats the doctrine that wickedness is disease, and not voluntary.