He that performeth acts tending to secure his prosperity in the other world with wealth acquired sinfully, never reapeth the fruits of these acts in the other world, in consequence of the sinfulness of the acquisitions (spent for the purpose). In the midst of deserts, or deep woods, or inaccessible fastnesses, amid all kinds of dangers and alarms or in view of deadly weapons upraised for striking him, he that hath strength of mind entertaineth no fear.

In plain words: If you use money gained dishonestly to do good deeds for the afterlife, you get no reward, because the money itself was wrong. A person with a strong mind feels no fear, whether in a desert, a deep forest, or facing weapons raised to strike him.