Mind over matter.
More German Proverbs:
Riches cause arrogance; poverty, meekness.German
Poor people's words go many to a sackful.
German
A doctor and a boor know more than a doctor alone.
German
He who borrows sells his freedom.
German
The salary of a good servant is never too high.
German
That is not in the looking-glass which is seen in the looking-glass.
German