Trusting too much to others has been the ruin of many.
More German Proverbs:
A man shows his character by what he laughs at.German
One cannot love and be wise.
German
The skinnier the dog, the more fleas he has.
German
Set a beggar on a horse and he'll ride to the devil.
German
He who blows on the fire will get sparks in his eyes.
German
As fast as laws are devised, their evasion is contrived.
German