What do the Stoic Virtues Mean?

The Stoics often refer to the four cardinal virtues of Greek philosophy: prudence, justice, fortitude, and temperance.  (Or if you prefer: wisdom, morality, courage, and moderation.) We don’t know where this classification originated.  It appears to go back as far as Plato or Socrates, although probably even further.  This was a very ancient, conventional schema …