Leave no nail unclenched.
More Italian Proverbs:
Even a horse, though he has four feet, stumbles.Italian
He who doth his own business defileth not his fingers.
Italian
He who excuses, accuses himself.
Italian
How can the cat help it if the maid be a fool?
Italian
He who eats pears with his master should not choose the best.
Italian
When there is nothing the church loses.
Italian