A Series of Lessons in Gnani Yoga: The Yoga of Wisdom

William Walker Atkinson was an attorney, merchant, publisher, and author, as well as an occultist and an American pioneer of the New Thought movement. 

Each branch of Yoga is but a path leading toward the one end—unfoldment, development, and growth. He who wishes first to develop, control and strengthen his physical body so as to render it a fit instrument of the Higher Self, follows the path of "Hatha Yoga." He who would develop his will-power and mental faculties, unfolding the inner senses, and latent powers, follows the path of "Raja Yoga." He who wishes to develop by "knowing"—by studying the fundamental principles, and the wonderful truths underlying Life, follows the path of "Gnani Yoga." And he who wishes to grow into a union with the One Life by the influence of Love, he follows the path of "Bhakti Yoga." But it must not be supposed that the student must ally himself to only a single one of these paths to power.