A favour ill placed is great waste.
More French Proverbs:
Honest poverty is thinly sown.French
The fool's mother is always pregnant.
French
Touch not another man's money, for the most honest never added to it.
French
He who has two women loses his soul; he who has two houses loses his mind.
French
By beating love decays.
French
Let not your shirt know your way of thinking.
French