Authors:

The spirit of humanity, like the forces of nature, and like the physical life, is at bottom energy.... Spiritual life, therefore, is just as much a development out of what has gone before in the evolutionary process as physical life is; which means that the origin of spiritual life is from within.

The spirit of humanity, like the forces of nature, and like the physical life, is at bottom energy.... Spiritual life, therefore, is just as much a development out of what has gone before in the evolutionary process as