"Man is like a tree, with the mighty trunk of intellect, the spreading branches of imagination, and the roots of the lower instincts that bind him to the earth. The moral life, however, is the fruit he bears; in it his true nature is revealed. It is the prerogative of man that he need not blindly follow the law of his natural being, but is himself the author of a higher moral law, and creates it even in acting it out."