He who torments others does not sleep well.
More French Proverbs:
He has enough to do who holds the handle of a frying-pan.French
A crooked stick will have a crooked shadow.
French
A healthy man is a successful man.
French
God alone understands fools.
French
To do, one must be doing.
French
When the kitchenmaids are together the roast burns.
French