In this book, the recognized master of yoga and the founder of his own school B. K. C. Iyengar gives his interpretation of the most famous ancient Indian treatise - Yoga-sutram Patanjali . The work has already been devoted to individual monographs, many comments have been written to them. However, according to Iyengar, translations are sometimes difficult to understand, comments are also difficult to understand; and interpretations differ from each other. Nevertheless, the author does not lose hope that he will be able to help those who follow along with him through self-knowledge. The book contains Sanskrit terms that are contained in the sutras, and their dictionary definitions. The master selected those that, in the light of his own practice and experience, he considered the most accurate.