It is a law both of the intellectual and the spiritual nature that by beholding we become changed. The mind gradually adapts itself to the subjects upon which it is allowed to dwell. It becomes assimilated to that which it is accustomed to love and reverence. Man will never rise higher than his standard of purity or goodness or truth. If self is his loftiest ideal, he will never attain to anything more exalted. Rather, he will constantly sink lower and lower. The grace of God alone has power to exalt man. Left to himself, his course must inevitably be downward.
– Mind, Character, and Personality, Vol. 1, pg. 418