A fault that is denied once is committed twice.
More French Proverbs:
The most friendly fortune trips up your heels.French
The sea refuses no river.
French
The bagpipe never utters a work till its belly is full.
French
The weather, fleecy clouds, and a made up woman don't last long.
French
One must be either anvil or hammer.
French
He who trusts a woman and leads an ass will never be free from plague.
French