Although it was over 50 years ago, I have not forgotten the moment when, after exploring the maze of Indian metaphysics, I reached its central Thought. I read that if we go deeper and deeper into the self we can arrive at last at the recognition of Atman, the essential self; and that if we go deeper into the not-self, the world that seems so solid and real, pulling aside veil after veil of illusion, we shall find Brahman, the ultimate reality; and that Atman and Brahman are identical.