This simplified Course of Raja Yoga is based on the author's experience in its practice under personal tuition and with the benefit of a wide study of yoga literature. The books on the subject go into great detail on the philosophy of yoga. Many are just commentaries on the Yoga Sutras of Patanjali, but they do not give detailed instructions in lesson form. There was therefore a need for a graded practical course for the guidance of those unable to have personal tuition. The book can be one's teacher, the instructions being given in the form of "do this" rather than as vague suggestions.