If your head is made of butter, don’t be a baker.
More French Proverbs:
See a pin and let it lie, you'll want a pin before you die.French
The attack tames the beast.
French
Laughing is not always the proof of a mind at ease.
French
Big head, little wit.
French
If you don't want to be deceived, then marry on February 30th.
French
The first blow is as good as two.
French