From one point of view this teaching has been conclusively proved by Modern Science. The evolution of the external form has been traced throughout all the kingdoms and is no longer in question. The ancient teachers of evolution, though less exact in detail, were more accurate in fact, in postulating a "something within" which alone could make the external evolution of form of any intelligible purpose. The Spiritual Soul—the Life, Consciousness, Spirit, Intelligence, whatever we may choose to call it—was formless in itself, but ever assuming new forms by a process called metempsychosis, metasomatosis, metangismos, etc., which in the human stage becomes reïncarnation, the rebirth or Punarjanman of the Hindûs.
So much has been written on metempsychosis and reïncarnation of late that it is hardly necessary to dwell on a now so familiar idea. In its widest sense the whole process of nature is subject to this mode of existence, and in its more restricted sense it is the path of pilgrimage of the Soul in the desert of Matter. In treating of a philosophical conception, which has already been completely established as far as its "visible side" is concerned by the researches of Modern Science in the field of evolution, it is a waste of time to obscure the main issue by a rehashing of the superstitious belief that the human Soul might pass back to the brute. It may be that this superstition arose from the consideration that the body and lower vestures of the Soul were shed off and gradually absorbed by the lower creation in the alchemical processes of nature. This was the fate of the "Purgations" of the Soul, but the Soul itself when once it had passed from bodies of the lower kingdoms, to bodies in the man-stage, could not retrogress beyond the limits of that human kingdom.
By a glance at the Diagram, and regarding it from the microcosmic point of view, it is easy to see that the inner nature of man is more complex than the elementary trichotomy of Body, Soul, and Spirit, might lead us to suppose. Each plane of Being, for which the Soul has its own appropriate Vesture, is generated from an "indivisible point," as Simon called it, a zero-point, to use a term of modern Chemistry; six of which are shown in the Diagram, and each plane of Being is bounded by such zero-points, for they are points like that of the Circle whose centre is everywhere and circumference nowhere.
To pass on to the soteriology of Simon. The general concept of this presents no difficulty to the student of Eastern Religions. The idea that the great teachers are Avatâras, incarnations, or descents, of the Supreme Being, appearing on earth to aid mankind, is simple enough to comprehend in itself, and would be open to little objection, were it not for the theological dogmas and mythological legends that are wont to be so busily woven round the lives of such teachers. In the present age it is hardly necessary for us, with the experience of the past before our eyes, to raise dissension as to whether such a manifestation is entirely divine, or entirely human, or perfectly human and divine at one and the same time, or neither or all of these.
Eastern philosophy, regarding not only the external phenomenal world as ever-changing and impermanent, but also all appearance or manifestation—no matter how subjective it may be to us now—as not the one Truth in itself, which it claims alone to be without change, it is easy to see the reason why the Gnostic Philosophers for the most part held to Doceticism—that is to say that the body of a Saviour was not the Saviour himself, but an appearance. The heat of polemical controversy may have led to exaggerated views on both sides, but the philosophical mind will not be distressed at the thought that the body is an appearance or mask of the real man, and that it forms no part of his eternal possession. None the less the body is real to us here, for we all have bodies of a like nature, and appearances are real to appearances. Yet this does not invalidate the further consideration that there are other bodies, vestures, or vehicles of consciousness, besides the gross physical "coat of skin," for the use of the spiritual man, each being an "appearance" in comparison to the higher vehicle, which is in its turn an "appearance" to that which is more subtle and less material or substantial than itself.
Thus, in the descent from the Divine World, the Soul transforms itself, or clothes itself in forms, or bodies, or vestures, which it weaves out of its own substance, like to the Powers of the Worlds it passes through, for every Soul has a different vehicle of consciousness for every World or Plane.
But the doctrine of the Soter, or Saviour, does not apply until the Christ-stage or consummation is reached. Following the idea of rebirth, there is a spiritual life cycle, or life-thread, on which the various earth-lives are strung, as beads on a necklace, each successive life being purer and nobler, as the Soul gains control of matter, or the driver control of the chariot and steeds that speed him through the experiences of life. As the end of this great cycle approaches, an earthly vehicle is evolved that can show forth the divine spirit in all the fulness possible to this world or phase of evolution.
Now as the problem can be viewed from either the internal or external point of view, we have the mystery of the Soul depicted both from the side of the involution of spirit into matter and of the evolution of matter into spirit. If, on the one hand, we insist too strongly on one view, we shall only have a one-sided conception of the process; if, on the other, we neglect one factor, we shall never solve the at present unknown quantity of the equation. Thus the Soul is represented as the "lost sheep" struggling in the meshes of the net of matter, passing from body to body, and the Spirit is represented as descending, transforming itself through the spheres, in order to finally rescue its Syzygy from the bonds that are about her.
The Soul aspires to the Spirit and the Spirit takes thought for the Soul; as the Simonians expressed it:
The male (Heaven, i.e., the Nous or Christ, or Spiritual Soul) looks down from above and takes thought for its co-partner (or Syzygy); while the Earth (i.e., the Epinoia or Jesus, or Human Soul) from below receives from the Heaven the intellectual (in the spiritual and philosophical sense, of course) fruits that come down to it and are cognate with the Earth (i.e., of the same nature essentially as Epinoia, who is essentially one with Nous).