388-311 BC, Greek Dramatist
As iron is eaten away by rust, so the envious are consumed by their own passion.
Antisthenes – [Envy]
Observe your enemies, for they first find out your faults.
Pay attention to your enemies for they are the first to discover your mistakes.
Serve your enemies for they first find out your faults
We must not contradict, but instruct him that contradicts us; for a madman is not cured by another running mad also.
Antisthenes – [Argument]