Mind is the medium of a power or powers superior to the natural man. In speaking of mind we naturally embrace this power, as in speaking of a lever, we often embrace the power that controls it. In the latter case the mistake arises from our ignorance of mathematics, for if we understood the science of mathematics we should never confound the lever with the power moving it. So in regard to mind, the body may be compared to dead weight, the mind to a lever, both governed by a superior and intelligent force. There is no intelligence in the body or in the mind but only in the higher power that governs them. The natural man cannot understand this and as happiness or misery follows our acts and our acts depend upon our knowledge of ourselves, it is not strange that we are often in trouble.
All men admit the existence of these two motive powers, truth and error, but not as powers independent of the mind and superior to it. Every development of science reveals the higher one to man; he sees and recognizes it in particular instances but never as the one controlling power which shapes and governs all our right actions. The other, or lower one, is animal power and a servant of the first. To know ourselves is to separate and distinguish these powers from the mind which they govern.