The divine principle of unity has ever been that of an inner inter-relationship. This is revealed in some of its earliest stages in the evolution of multicellular life on this planet. The most perfect inward expression has been attained by man in his own body. But what is most important of all is the fact that man has also attained its realization in a jnore subtle body outside his physical system. He misses himself when isolated; he finds his own larger and truer self in his wide human relationship, His multicellular body is born and it dies; his multi-personal humanity is immortal. In this ideal of unity he realizes the eternal in his life and the boundless in his love. The unity becomes not a mere subjective idea, but an energizing truth. Whatever name may be given to it, and whatever form it symbolizes, the consciousness of this unity is spiritual, and our effort to be true to it is our religion. It ever waits to be revealed in our history in a more and more perfect illumination. We have our eyes, which relate to us the vision of the physical universe. We have also an inner faculty of our own which helps us to find our relationship with the supreme self of man, the universe of personality. This faculty is our luminous imagination, which in its higher stage is special to man. It offers us that vision of wholeness which for the biological necessity of physical survival is superfluous; its purpose is to arouse in us the sense of perfection which is our true sense of immortality. For perfection dwells ideally in Man the Eternal, inspiring love for this ideal in the individual, urging him more and more to realize it. This classic is organized as follows: I. Man’s Universe II. The Creative Spirit III. The Surplus in Man IV. Spiritual Union V. The Prophet VI. The Vision VII. The Man of My Heart VIII. The Music Maker IX. The Artist X. Man’s Nature XII. The Teacher XIII. Spiritual Freedom XIV. The Four Stages of Life XV. Conclusion