He who peeps through a hole may see what will vex him.
More Spanish Proverbs:
The threshold says nothing but what it hears of the hinge.Spanish
Hunger and cold give a man up to his enemy.
Spanish
Between the hand and the mouth the soup is lost.
Spanish
Between brothers, two witnesses and a notary.
Spanish
One cannot blow and swallow at the same time.
Spanish
There is no worse apprentice than the one who doesn't want to know.
Spanish