Mahayana teachings, while in the "mahatma letters" Buddhism is present on virtually every page, and it is immediately evident from the frequent use of specific terminology on the Sanskrit, Pali, Tibetan, Chinese and Mongolian languages. The Mahatma letters Humphreys wrote that theosophists got their knowledge from two Masters who prepared Blavatsky for her mission in the world. Their letters were published later, in 1923: it was a book The Mahatma Letters to A. P. Sinnett. He noted that the founders of the theosophical movement, Blavatsky and Olcott, publicly declared themselves Buddhists and, more important still, the two Masters, who founded the Theosophical movement, spoke: "Our Great Patron is the Teacher of Nirvana and the Law." And their Master, the Maha-Chohan, once said, describing himself and his fellow-adepts, that they were all "the devoted followers of the spirit incarnate of absolute self-sacrifice, of philanthropy, divine kindness, as of all the highest virtues attainable on this earth of sorrow, the man of men, Gautama Buddha." Speaking about Buddha, Humphries repeatedly quoted the Master Kuthumi, for example: "Our great Buddha—the patron of all the adepts, the reformer and the codifier of the occult system." "In our temples there is neither a god nor gods worshipped, only the thrice sacred memory of the greatest as the holiest man that ever lived." Humphreys stated: "All who dare to call themselves Theosophists or Buddhists must study, and teach and strive to apply this garnered Wisdom." The Secret Doctrine and the Books of Kiu-te Oldmeadow wrote that Blavatsky's second major work, The Secret Doctrine, includes elements that clearly derive from the Vajrayana, often conflated with Vedantic ideas. He noted: "Lama Kazi Dawa Samdup was sufficiently confident of Blavatsky's account of the Bardo to endorse her claim that she had been initiated into 'the higher lamaistic teachings'." Lama Kazi Dawa Samdup (a translator of The Tibetan Book of the Dead) believed that Blavatsky had "intimate acquaintance with the higher lamaistic teachings". Humphreys in his autobiography praised The Secret Doctrine. At the time he published an abridgment of this book. Blavatsky claimed to have access to a popularised version of Buddhist secret doctrines, a fourteen volume esoteric commentary, "worked out from one small archaic folio, the Book of the Secret Wisdom of the World", as well as secret texts she termed Kiu-Te. Buddhologist David Reigle identified Blavatsky's "Books of Kiu-te" as the Tantra section of the Tibetan Buddhist canon.