"Advanced Course in Yogi Philosophy and Oriental Occultism" by William Walker Atkinson is a comprehensive exploration of yogic philosophy and Eastern occultism. It covers advanced concepts such as meditation, energy manipulation, and spiritual development. The book offers practical guidance and insights into the mind-body-spirit connection, esoteric knowledge, and the attainment of higher states of consciousness. Written by an esteemed author in the early 20th century, it serves as a valuable resource for those interested in delving deeper into yogic philosophy and the occult.