All is not gold that glitters.
More French Proverbs:
Slander! slander! some of it always sticks.French
The one with a running nose always wants to blow someone else's.
French
If you lend something you may lose it, but not if you give it.
French
Easy to say is hard to do.
French
Possession is as good as a title.
French
Thrive by honesty or remain poor.
French