Let the cobbler stick to his last.
More Traditional Proverbs:
He that is afraid of bad luck will never know goodTraditional
He's pushing up the daisies.
Traditional
Who never climbed, never fell.
Traditional
Who ever does not respect confidence will never find happiness in their path.
Traditional
Sleep is better than medicine.
Traditional
You have to walk up each step to get to the top of the staircase.
Traditional