He who invites storks must have frogs in the house.
More German Proverbs:
Opportunity only knocks once.German
Whoever cares to learn will always find a teacher.
German
He who travels with hope, has poverty for his coachman.
German
Wine makes secrets float to the surface.
German
Criticism of the state is all right, but don't forget the nation is you.
German
Judges should have two ears, both alike.
German