Grass will not grow on a volcano.
More French Proverbs:
It is not the big oxen that do the best day's work.French
To do like the monkey, get the chesnuts out of the fire with the cat's paw.
French
To the devil with so many masters, said the toad to the harrow.
French
Dead lions do not roar.
French
He who recovers but the tail of his cow does not lose all.
French
Don't dance on a volcano.
French