To a rogue a rogue and a half.
More French Proverbs:
It is a double pleasure to deceive the deceiver.French
Tasty is the chicken that is fed by someone else.
French
To contradict means sometimes to knock at the door to see if anyone is at home.
French
The interested friend is a swallow on the roof. (Prepared to leave at the approach of winter.)
French
You pays your money and you takes your choice.
French
He that would go to sea for pleasure would go to hell for a pastime.
French