The tongue of a bad friend cuts more than a knife.
More Spanish Proverbs:
It is in vain to cast nets in a river where there are no fish.Spanish
Be not an esquire where you were a page.
Spanish
An inch in a sword, or a palm in a lance, is a great advantage.
Spanish
If there is still doubt do not accuse.
Spanish
To be like the tailor of Campillo, who worked for nothing, and found thread.
Spanish
Fear guards the vineyard.
Spanish