A good book praises itself.
More German Proverbs:
Nature hangs out her sign everywhere.German
Stand up, farthing, let the florin sit down.
German
Straying shepherd, straying sheep.
German
The late comer is ill lodged.
German
It's a bad bridge that is narrower than the stream.
German
Instead of complaining that the rosebush is full of thorns, be happy that the thorn bush has roses.
German