I am grateful to Dr. Hajime Nakamura, Professor Emeritus of the University of Tokyo and founder of the Eastern Institute, Tokyo, for help with the translation of the First Part. For errors that remain I am entirely responsible.
The late Shankaracarya of Sringeri, H.H. Abhinava Vidyatirtha, showed much interest in this Vivaraṇa and encouraged the present translator to tackle this difficult text, which (he said) might be of great importance in the study of Śaṅkara.
The trustees of the Trevor Leggett Adhyatma Yoga Trust wish to express their grateful thanks to Dr Kengo Harimoto of Mahidol University,Thailand, who kindly agreed to write a Foreword to this E-book edition of The Complete Commentary by Śaṅkara on the Yoga Sutras, translated by Trevor Pryce Leggett. Dr Harimoto’s most valuable and interesting Foreword reviews and puts in context some of the comments that have been made on the author’s translation since it was first published in London in 1990 and also on the authenticity of the Vivaraṇa as a work by Śaṅkara.