He who sows the seed of discord works in the devil’s barn.
More French Proverbs:
Every one preaches for his own saint.French
Nip sin in the bud.
French
He may swim boldly who is held up by the chin.
French
We shall see, as the blind man said.
French
There is no pride like that of a beggar grown rich.
French
There is no bush so small but casts its shadow.
French