the Self begins to show his radiance and beauty in manifested union. Thus by studying diversity he reaches the conception of unity, and is led into the understanding of the One. To him the realisation of the Self comes through the study of the Not-Self, by the separation of the Not-Self from the Self. Thus he does by knowledge and experience what the other does by pure thinking and by faith. In this path of finding the Self through the Not-Self, the so-called Siddhis are necessary. Just as you cannot study the physical world without the physical senses, so you cannot study the astral world without the astral senses, nor the mental world without the mental senses. Therefore, calmly choose your ends, and then think out your means, and you will not be in any difficulty about the method you should employ, the path you should tread. Thus we see that there are two methods, and these must be kept separate in your thought. Along the line of pure thinking—the metaphysical line—you may reach the Self. So also along the line of scientific observation and experiment—the physical line, in the widest sense of the term physical—you may reach the Self. Both are ways of Yoga. Both are included in the directions that you may read in the Yoga Sutras of Patanjali. Those directions will cease to be self-contradictory, if you will only separate in your thought the two methods. Patanjali has given, in the later part of his Sutras, some hints as to the way in which the Siddhis may be developed. Thus you may find your way to the Supreme. Yoga and Morality