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The primary source for this document is The Secret Oral Teachings in Tibetan Buddhist Sects by Alexandra David-Neel & Lama Yongden. Alan Watts calls this work "a wonderfully lucid account of the Madhyamika (or 'middle-way') School of Buddhism, a method of meditation and enlightenment which was worked out sometime between 150 and 250 AD by the great Indian sage and pundit, Nagarjuna."