He who wrongs someone has to expect something in retaliation.
More Italian Proverbs:
Threats are arms for the threatened.Italian
Don't bite till you know whether it is bread or a stone.
Italian
To whom you tell your secret you surrender your freedom.
Italian
He that marries a widow with four children marries four thieves.
Italian
Poor men's money and cowards' weapons are often flourished.
Italian
That costs dear which is bought with begging.
Italian