He that says A, must also say B.
More German Proverbs:
Mules make a great fuss about their ancestors having been donkeys.German
Rich people are everywhere at home.
German
A lot will stick to dirty hands.
German
Bad tidings always come too soon.
German
There are no bad beers; some kinds are better than others.
German
Who stands bail for someone is being teased by the devil.
German