He who puts his nose in a turd does not know what he is smelling.
More German Proverbs:
If I am to be drowned, it shall be in clean water.German
Today must not borrow from tomorrow.
German
He laughs at scars who never felt a wound.
German
Mules make a great fuss about their ancestors having been donkeys.
German
'Tis written, "What's not your own, that let alone."
German
He that would cheat a Jew, must be a Jew.
German