Ravens do not peck out raven’s eyes.
More French Proverbs:
God helps him who helps himself.French
He gains enough who loses sorrow.
French
Misfortunes come on horseback and depart on foot.
French
There is no old bread that cannot find its cheese.
French
One does not always hit what one aims at.
French
No wind can do him good who steers for no port.
French