458. We, in common with you and all animals, possess an infinitesimal portion of this power, varying in degree in different classes and in different individuals. When you raise your arm, as in the act of lifting or moving a body, you direct by the force of your will-power galvanic currents on the muscles required to perform the function. The muscles acting as levers, through the stimulus of the subtle element, act and react on the more solid parts, the bones, and thus is the object laid hold of and moved, and still you do not come into direct contact with the object. Now, this is called a _very simple_ operation, and so it would appear, but who understands it? Although advanced spirits are much more conversant with the forces operating in nature than the most intellectually developed man in the form, still they do not, nor can they ever, as long as eternity rolls on, understand the hidden sphere of cause. The operation of the will it is impossible to understand. Now, as I have said, we are not possessed of physical bodies; still we can make the imponderable elements subserve our purposes by acting as bones, nerves, and muscles. 459. Touching our peregrinations and voyages of discovery, about which so much has been said by spirits, as well as mortals, I will say that it is a fallacy to suppose that every spirit can visit at will the planets of the solar system, much less those of the more remote systems, since I am certain that none but the residents of the seventh sphere, or the angels of the “Supernal Heavens,” have the power to do so; because each planet, being an inhabited globe, hath its concentric or spiritual spheres, through all of which in order to reach it a spirit must pass. It is obvious, therefore, according to the immutable law of progression, that the transit of a spirit to a distant planet would require its adaptation to the highest sphere of that body. 460. Having spoken of the angels of the “Supernal Heavens,” I will explain what is meant by this designation. They are those pure and comparatively exalted beings who, having advanced beyond the highest sphere of the planet to which they belonged, and attained a very high state of moral and intellectual development, have been admitted into that great and illimitable sphere of progression which lies outside of all other spheres, and in which the greatest conceivable degree of harmony reigns. It is composed of one grand harmonial society, whose members are privileged to go wheresoever they will through the boundless empire of space. They are principally from the planets Jupiter and Saturn, and hold a much more distinguished rank in the intellectual, moral, and social system than the inhabitants of earth. I have not learned that any spirit from our planet has yet reached the Supernal Heaven.