Spit not in the well, you may have to drink its water.
More French Proverbs:
The town that parleys is half surrendered.French
For a stubborn ass a hard goad.
French
Glutton: one who digs his grave with his teeth.
French
To squeeze an eel too hard is the way to lose it.
French
He who stops at every stone never gets to his journey's end.
French
Hang a thief when he's young, and he'll not steal when he's old.
French