Observe 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.
The most necessary learning is that which unlearns evil.
Quarrels often arise in marriages when the bridal gifts are excessive.
As iron is eaten away by rust, so the envious are consumed by their own passion.
Pay attention to your enemies, for they are the first to discover your mistakes.