There is no lock on the purse of a gambler.
More French Proverbs:
Where there is no sore there needs no plaister.French
He carries fire in one hand, water in the other.
French
An ass does not stumble twice over the same stone.
French
The ball always looks for the best player.
French
Marriages sealed with rings end with drawn knives.
French
What is bad for one is good for another.
French