The actual title of this book is: Essence of the Ocean of Attainments.

“The Guhyasamāja is a fundamental tantra in Tibetan Buddhism. Yael Bentor’s translation of the commentary written by the first Panchen Lama, Losang Chökyi Gyaltsen, is a brilliant piece of scholarship, the fruit of intensive study of Tibetan tantric ritual and meditation. The translation is rendered with exemplary clarity and a readable style that does full justice to the intellectual sophistication both of the Tibetan author and his translator. The Essence of the Ocean of Attainments will therefore delight anyone who wishes to explore Tibetan interpretations of Indian Buddhist tantric practice.
— PER KVÆRNE, professor emeritus, University of Oslo”

“Just to state two reasons why this work should be read by all those aspiring to pursue the yoga practices of tantric Buddhism: First, in her introduction Yael Bentor has provided one of the clearest and best explanations of the exclusive technique of Unexcelled Mantra by which wisdom and method are combined within a single cognition. This fundamental practice is the very essence of Unexcelled Mantra. Second, in these times of fascination for high tantric practices, especially those of the completion stage, it is refreshing, and indeed necessary, to see a highly competent translation of the prerequisite creation stage, delivered with the academic professionalism and the high-level scholarship of Professor Bentor.”
— GAVIN KILTY, translator, the Library of Tibetan Classics”