The Raja Yoga Sutra of Patanjali Maharishi is a complete manual for the exploration and control of one's own thoughts. It is a classical scripture of yoga and a holistic guidline for the physical, mental and spiritual aspects of meditation. This book is a precious source for the yoga practitioner in the West, especially so for the study of the spiritual psychology of mankind. Swami Durgananda's practical and dynamic commentaries of the Raja Yoga Sutras are taken form her lectures during the Advanced Yoga Teachers' Training Course in March 2001. They are the fruit of inspiration from the great yogis and saints Sri Swami Sivananda and Sri Swami Vishnu-devananda, as well as from over thirty years of intense personal practice and teaching experience. After an intense spiritual quest in India and North America, Swami Durgananda was initiated and trained in yoga by Sri Swami Vishnu-devananda (1927-1993), founder of the International Yoga Centres and Ashrams. As one of his most senior and clode students, she accompanied him on many travels both in the East and in the West. In accordance with the wishes of her teacher, Swami Durgananda established the Sivananda Yoga Vedanta Centres in Europe. Swami Vishnu-devananda guided her personally in the training of yoga teachers and conferred on her the title Yoga Acharya, as one of his spiritual successors. With ddep intuition Swami Durgananda is guiding many people on the inner path through her teachings on meditaiton, yoga psychology, nutrition, positive thinking and Eastern philosophy.