He that laughs on Friday may cry on Sunday.
More French Proverbs:
Spur not a willing horse.French
The greatest king must at last go to bed with a shovel.
French
Where the hostess is beautiful the wine is tasty.
French
The devil's meal turns half to bran.
French
The chicken that crows the loudest does not always give the biggest eggs.
French
A courtier should be without feeling and without honour.
French