for the Self by turning away from the Not-Self. It is necessary for the man who seeks the Self by the Self to have the quality which is called “faith,” in the sense in which I defined it before—the profound, intense conviction, that nothing can shake, of the reality of the Self within you. That is the one thing that is worthy to be dignified by the name of faith. Truly it is beyond reason, for not by reason may the Self be known as real. Truly it is not based on argument, for not by reasoning may the Self be discovered. It is the witness of the Self within you to his own supreme reality, and that unshakable conviction, which is shraddha, is necessary for the treading of this path. It is necessary, because without it the human mind would fail, the human courage would be daunted, the human perseverance would break, with the difficulties of the seeking for the Self. Only that imperious conviction that the Self is, only that can cheer the pilgrim in the darkness that comes down upon him, in the void that he must cross before—the life of the lower being thrown away—the life of the higher is realised. This imperious faith is to the Yogi on this path what experience and knowledge are to the Yogi on the other. To the Self Through the Not-self Turn from him to the seeker for the Self through the Not- Self. This is the way of the scientist, of the man who uses the concrete, active Manas, in order scientifically to understand the universe; he has to find the real among the unreal, the eternal among the changing, the Self amid the diversity of forms. How is he to do it? By a close and rigorous study of every changing form in which the Self has veiled himself. By studying the Not-Self around him and in him, by understanding his own nature, by analysing in order to understand, by studying nature in others as well as in himself, by learning to know himself and to gain knowledge of others; slowly, gradually, step by step, plane after plane, he has to climb upwards, rejecting one form of matter after another, finding not in these the Self he seeks. As he learns to conquer the physical plane, he uses the keenest senses in order to understand, and finally to reject. He says: “This is not my Self. This changing panorama, these obscurities, these continual transformations, these are obviously the antithesis of the eternity, the lucidity, the stability of the Self. These cannot be my Self.” And thus he constantly rejects them. He climbs on to the astral plane and, using there the finer astral senses, he studies the astral world, only to find that that also is changing and manifests not the changelessness of the Self. After the astral world is conquered and rejected, he climbs on into the mental plane, and there still studies the ever-changing forms of that Manasic world, only once more to reject them: “These are not the Self.” Climbing still higher, ever following the track of forms, he goes from the mental to the Buddhic plane, where