Full Idea
Against a villain, villainy is not a useless weapon.
Gist of Idea
Against a villain, villainy is not a useless weapon
Source
Epicharmus (comedies (frags) [c.470 BCE], B32), quoted by (who?) - where?
Book Reference
'Ancilla to the Pre-Socratic Philosophers', ed/tr. Freeman,Kathleen [Harvard 1957], p.37