He is a thief indeed who robs a thief.
More French Proverbs:
He who sows the seed of discord works in the devil's barn.French
The tiredness of the body is the health of the soul.
French
Dreams go by contraries.
French
The sheep that bleats loses a mouthful.
French
You must not throw stones into your neighbor's garden.
French
No moon, no man.
French