Two eyes, two ears, only one mouth.
More German Proverbs:
Who would be young in age, must in youth be sage.German
It is better to turn back than go astray.
German
Having is haying, come whence it may.
German
A prince without ears to listen has no head to govern.
German
To a quick ear half a word.
German
When a man is down, everybody runs over him.
German