On a fool’s beard the barber learns to shave.
More Italian Proverbs:
He would slaughter a bug to drink its blood.Italian
Love knows not labour.
Italian
The dog that bites does not bark in vain.
Italian
Wolves have howled at the moon for centuries, yet it is still there.
Italian
There is no beard so well shaven but another barber will find something more to shave from it.
Italian
He who is guilty believes that all men speak ill of him.
Italian