Fourteen Lessons in Yogi Philosophy and Oriental Occultism by American occultist William Walker Atkinson was first published in 1904 under the pseudonym Yogi Ramacharaka. Written at a time when eastern religion and philosophy were getting popular with Western audiences, these fourteen lessons were originally part of a correspondence class course. The book is a basic introduction to yogi philosophy and starts with the seven principles of man - physical, astral, prana, instinctive intelligence, intellect, spiritual mind, and spirit. When Atkinson wrote under the pseudonym Yogi Ramacharaka, he claimed to be a Hindu, and as this persona, he helped to popularize Eastern concepts in America, with Yoga and a broadly-interpreted Hinduism being particular areas of focus. The works of Yogi Ramacharaka were published over the course of nearly ten years beginning in 1903.