Not to be ashamed of sin is to sin double.
More German Proverbs:
Fir and water are good servants, but bad masters.German
Do not ship all in one bottom.
German
Spend not, where you may save; spare not, where you must spend.
German
What you do, do quickly.
German
He who has once burnt his mouth always blows his soup.
German
Silk and velvet put out the kitchen fire.
German