Yogi Ramacharaka 
Lessons in Gnani Yoga [EPUB ebook] 
The Yoga of Wisdom

‘Yogi Ramacharaka’ was the pen name of William Walker Atkinson, an American attorney, businessman, and author who was instrumental in introducing the concepts of yoga to the West in the nineteenth century. For many in the era, this comprehensive text served as the first introduction to yoga philosophy and practice. The branch of inquiry that Atkinson terms "Gnani" yoga deals with metaphysical questions about the universe and the significance of humans in relation to the cosmos.