Again, we can assume that where we see in Time a certain stage of development, there must have been a past to that development. Therefore, if the soul enters this life with a certain development of personality, it must have prepared it in other precedent lives here or elsewhere. Or, if it only takes up a ready-made life and personality not prepared by it, prepared perhaps by a physical, vital and mental heredity, it must itself be something quite independent of that life and personality, something which is only fortuitously connected with the mind and body and cannot therefore be really affected by what is done or developed in this mental and bodily living. If the soul is real and immortal, not a constructed being or figure of being, it must also be eternal, beginningless in the past even as endless in the future; but, if eternal, it must be either a changeless self unaffected by life and its terms or a timeless Purusha, an eternal and spiritual Person manifesting or causing in time a stream of changing personality. If it is such a Person, it can only manifest this stream of personality in a world of birth and death by the assumption of successive bodies,—in a word, by constant or by repeated rebirth into the forms of Nature.
But the immortality or eternity of the soul does not at once impose itself, even if we reject the explanation of all things by eternal Matter. For we have also the hypothesis of the creation of a temporary or apparent soul by some power of the original Unity from which all things began, by which they live and into which they cease.On one side, we can erect upon the foundation of certain modern ideas or discoveries the theory of a cosmic Inconscient creating a temporary soul, a consciousness which after a brief play is extinguished and goes back into the Inconscient. Or there may be an eternal Becoming, which manifests itself in a cosmic Life-force with the appearance of Matter as one objective end of its operations and the appearance of Mind as the other subjective end, the interaction of these two phenomena of Life-force creating our human existence. On the other side, we have the old theory of a sole-existing Superconscient, an eternal unmodifiable Being which admits or creates by Maya an illusion of individual soul-life in this world of phenomenal Mind and Matter, both of them ultimately unreal,—even if they have or assume a temporary and phenomenal reality,— since one unmodifiable and eternal Self or Spirit is the only entity. Or we have the Buddhist theory of a Nihil or Nirvana and, somehow imposed upon that, an eternal action or energy of successive becoming, Karma, which creates the illusion of a persistent self or soul by a constant continuity of associations, ideas, memories, sensations, images. In their effect upon the life problem all these three explanations are practically one; for even the Superconscient is for the purposes of the universal action an equivalent of the Inconscient; it can be aware only of its own unmodifiable self-existence: the creation of a world of individual beings by Maya is an imposition on this self-existence; it takes place, perhaps, in a sort of self-absorbed sleep of consciousness, sushupti, (Prajna of the Mandukya Upanishad, the Self situated in deep sleep, is the lord and creator of things.) out of which yet all active consciousness and modification of phenomenal becoming emerge, just as in the modern theory our consciousness is an impermanent development out of the Inconscient. In all three theories the apparent soul or spiritual individuality of the creature is not immortal in the sense of eternity, but has a beginning and an end in Time, is a creation by Maya or by Nature-Force or cosmic Action out of the Inconscient or Superconscient, and is therefore impermanent in its existence. In all three rebirth is either unnecessary or else illusory; it is either the prolongation by repetition of an illusion, or it is an additional revolving wheel among the many wheels of the complex machinery of the Becoming, or it is excluded since a single birth is all that can be asked for by a conscious being fortuitously engendered as part of an inconscient creation.
In these views, whether we suppose the one Eternal Existence to be a vital Becoming or an immutable and unmodifiable spiritual Being or a nameless and formless Non-being, that which we call the soul can be only a changing mass or stream of phenomena of consciousness which has come into existence in the sea of real or illusory becoming and will cease to exist there,—or, it may be, it is a temporary spiritual substratum, a conscious reflection of the Super-conscient Eternal which by its presence supports the mass of phenomena. It is not eternal, and its only immortality is a greater or less continuity in the Becoming. It is not a real and always existent Person who maintains and experiences the stream or mass of phenomena. That which supports them, that which really and always exists, is either the one eternal Becoming or the one eternal and impersonal Being or the continual stream of Energy in its workings. For a theory of this kind it is not indispensable that a psychic entity always the same should persist and assume body after body, form after form, until it is dissolved at last by some process annulling altogether the original impetus which created this cycle. It is quite possible that as each form is developed, a consciousness
develops corresponding to the form, and as the form dissolves, the corresponding consciousness dissolves with it; the One which forms all, alone endures for ever. Or, as the body is gathered out of the general elements of Matter and begins its life with birth and ends with death, so the consciousness may be developed out of the general elements of mind and equally begin with birth and end with death. Here too, the One who supplies by Maya or otherwise the force which creates the elements, is the sole reality that endures. In none of these theories of existence is rebirth an absolute necessity or an inevitable result of the theory- (In the Buddhist theory rebirth is imperative because Karma compels it; not a soul, but Karma is the link of an apparently continuing consciousness,—for the consciousness changes from moment to moment: there is this apparent continuity of consciousness, but there is no real immortal soul taking birth and passing through the death of the body to be reborn in another body.)
Sri Aurobindo. (The Life Divine, Book II, Part II, Ch. 20.)