The Yogi Philosophy may be divided into several great branches, or fields. What is known as "Hatha Yoga" deals with the physical body and its control; its welfare; its health; its preservation; its laws, etc. What is known as "Raja Yoga" deals with the Mind; its control; its development; its unfoldment, etc. What is known as "Bhakti Yoga" deals with the Love of the Absolute--God. What is known as "Gnani Yoga" deals with the scientific and intellectual knowing of the great questions regarding Life and what lies back of Life -- the Riddle of the Universe.