One bad eye spoils the other.
More German Proverbs:
It is too much to expect of a cat that she should sit by the milk and not lap it.German
Where there no fools, there would be no wise men.
German
It is harder work getting to hell than to heaven.
German
All freight lightens, said the skipper, when he threw his wife overboard.
German
Never fight an enemy whilst it is possible to cheat him.
German
Fortune gives her hand to a bold man.
German