That subtle being by which this universe subsists, it is the Real, it is the Âtman and thou, Svetaketu, art It.'" The writers of these passages have not quite reached Śankara's point of view, that the Âtman is all and the whole universe mere illusion or Mâyâ. Their thought still tends to regard the universe as something drawn forth from the Âtman and then pervaded by it. But still the main features of the later Advaita, or philosophy of no duality, are there. All the universe has grown forth from the Âtman: there is no real difference in things, just as all gold is gold whatever it is made into. The soul is identical with this Âtman and after death may be one with it in a union excluding all duality even of perceiver and perceived. A similar union occurs in sleep. This idea is important for it is closely connected with another belief which has had far-reaching consequences on thought and practice in India, the belief namely that the soul can attain without death and as the result of mental discipline to union[189] with Brahman. This idea is common in Hinduism and though Buddhism rejects the notion of union with the supreme spirit yet it attaches importance to meditation and makes Samâdhi or rapture the crown of the perfect life. In this, as in other matters, the teaching of the Upanishads is manifold and unsystematic compared with later doctrines. The older passages ascribe to the soul three states corresponding to the bodily conditions of waking, dream-sleep, and deep dreamless sleep, and the Bṛihad-Âraṇyaka affirms of the last (IV. 3. 32): "This is the Brahma world. This is his highest world, this is his highest bliss. All other creatures live on a small portion of that bliss." But even in some Upanishads of the second stratum (Mâṇḍukya, Maitrâyaṇa) we find added a fourth state, Caturtha or more commonly Turîya, in which the bliss attainable in deep sleep is accompanied by consciousness[190]. This theory and various practices founded on it develop rapidly. 4