Sri Aurobindo, on the basis of the foundation already established, that the manifestation is real, and that the role of the individual is to carry out the evolution of the involved consciousness to a self-discovery of Oneness with the Universal and the Transcendent, now takes up the reality of the individual, distinguishing his view from those that hold that the individual is simply an illusion or a temporary phenomenon.
“For it is no longer sufficient to suppose an illusory or temporary individual, created in each form by the play of consciousness; individuality can no longer be conceived as an accompaniment of play of consciousness in figure of body which may or may not survive the form, may or may not prolong its false continuity of self from form to form, from life to life, but which certainly need not do it. In this world what we seem at first to see is individual replacing individual without any continuity, the form dissolving, the false or transient individuality dissolving with it, while the universal Energy or some universal Being alone remains for ever; that might very well be the whole principle of cosmic manifestation. But if the individual is a persistent reality, an eternal portion or power of the Eternal, if his growth of consciousness is the means by which the Spirit in things discloses its being, the cosmos reveals itself as a conditioned manifestation of the play of the eternal One in the being of Sachchidananda with the eternal Many. Then, secure behind all the changings of our personality, upholding the stream of its mutations, there must be a true Person, a real spiritual Individual, a true Purusha. The One extended in universality exists in each being and affirms himself in this individuality of himself. In the individual he discloses his total existence by oneness with all in the universality. In the individual he discloses too his transcendence as the Eternal in whom all the universal unity is founded.”
Thus, the individual becomes a nexus by which the evolution of consciousness can take place out of the Inconscience, through the forms of Matter, Life and Mind; but ever an expression of the One and one with the Cosmic Manifestation.
Sri Aurobindo, The Life Divine, Book 2, Part 2, Chapter 20, The Philosophy of Rebirth