QUOTE : Philosophically defined, growth is the struggle of life to control its environment or, rather, to include more and more of its environment within the area of its own self-knowing. Perfect freedom of expression is the goal of all life. All things, both animate and inanimate, are striving for that freedom which lies in perfect expression. It naturally follows that there is but one freedom – perfection. Every creature is a slave to those parts of itself as yet unresponsive to the impulses of its internal life principle. Every individual consequently is a slave to his own material constitution; he is a prisoner held in by walls of unresponsive substance. Thus the natural expression of the inner life principle is to refine and improve the qualities of its outer vehicles that it may the more easily control and direct them. It is evident that the more refined the substance, the more easily it is influenced by subtle forces. By a certain definite organization, consciousness equips its outer nature with organs of responsiveness, so that the lower self comes ever more nearly en rapport with its own Cause. A common example is the radio, which is a mechanical contrivance constructed according to definite scientific principles which enable it to pick up vibratory rates of sound inaudible to even the delicate mechanism of the human ear.