Let your purse be your master.
More German Proverbs:
Woo the widow whilst she is in weeds.German
No one can guard against treachery.
German
A drink is shorter than a tale.
German
To advise is easier than to help.
German
One man knocks in the nail, and another hangs his hat on it.
German
He who inherits a farthing, is expected to disburse a dollar.
German