Spend not, where you may save; spare not, where you must spend.
More German Proverbs:
The beggar's bag is bottomless.German
Who refuses to submit to justice, must not complain of oppression.
German
Better aught than nought.
German
If the brain sows not corn, it plants thistles.
German
Youth and white paper take any impression.
German
Nature teaches us to love our friends, but religion our enemies.
German