Yogi Ramacharaka 
Fourteen Lessons in Yogi Philosophy and Oriental Occultism [EPUB ebook] 

Originally published in 1903, ‘Fourteen Lessons in Yogi Philosophy and Oriental Occultism’  demonstrates how to achieve the ultimate indulgence of the ‘pure spirit’ that defines us all.
Yogi Ramacharaka explains how to shed the ‘
sheaths that prevent its full expression’ via a series of lessons on ‘The Human Aura’, ‘Occult Therapeutics’, ‘The Astral World’, ‘Spiritual Evolution’, and much more. 
The author, Yogi Ramacharaka (
true name William Walker Atkinson), was and American ex-lawyer who turned to occultism and was a pioneer in the ‘New Thought Movement’.