As for the relevance of The Ātman-Brahman in Ancient Buddhism to the “Book of Dzyan,” the Upaniṣadic ātman or brahman has been equated by Blavatsky and the Theosophical Mahatma teachers to the first fundamental proposition of the Secret Doctrine: an omnipresent, eternal, boundless, and immutable principle. They give this as being what the Buddha originally taught, in accordance with what is taught in the ancient Wisdom Tradition that they represent. Since the Buddha denied the ātman, long taken by the Buddhist religion to be the ātman taught in the Hindu Upaniṣads, the Theosophical Mahatma teachers appear to be woefully uninformed, if not altogether imaginary. Kamaleswar Bhattacharya’s research found in this book is therefore of much importance to students of Theosophy. The main points of his research have been excerpted and placed within this context in the article by Nancy Reigle, “Ātman/Anātman in Buddhism and Its Implication for the Wisdom Tradition,” available here as: Atman_Anatman in Buddhism