Don’t cry before you are hurt.
More German Proverbs:
There is nothing so bad but may be of some use.German
What's one man's meat's another man's poison.
German
He who prizes little things, is worthy of great ones.
German
Apes remain apes, though you cloth them in velvet.
German
You catch the mice with bacon.
German
The dog returns to its vomit.
German