A wicked dog must be tied short.
More French Proverbs:
After one loss come many.French
Gentleness does more than violence.
French
He that would go to sea for pleasure would go to hell for a pastime.
French
The more fools, the more laughter.
French
He is not so much of a devil as he is black.
French
Gluttony has killed more than the sword.
French