William Walker Atkinson 
Self-Healing by Thought Force [EPUB ebook] 

From the first chapter: 'In taking up the question of Self-Healing I should say first, that to me all the various methods of healing by the power of the mind are but different forms of applying the same force. I think that the several practitioners of Suggestive Therapeutics, Mental Science, Christian Science, Faith Cure and all the rest, are using the same great force, the only difference being in the method of application.'