Steel whets steel.
More Spanish Proverbs:
Mother, what is marrying? Spinning, bearing children, and crying, daughter.Spanish
Women, wind, and fortune, soon change.
Spanish
He who has got four and spends five, has no occasion for a purse.
Spanish
The heart inside of a pumpkin or edible squash is only known by the knife.
Spanish
It is a wise son that knows his own father.
Spanish
He who was first an acolyte, and afterwards an abbot or curate, knows what the boys do behind the altar.
Spanish