Yogi Ramacharaka 
A Series of Lessons in Raja Yoga [EPUB ebook] 

“All is Mind”
Raja Yoga is a form of yoga chiefly concerned with controlling and using the energy of the mind by meditation. Raja Yoga is also known as Ashtanga Yoga.
As such, it is also considered to be the state of peace and contentment that arises from sustained yoga and meditation practice. Yogi Ramacharaka (William Walker Atkinson) was an American pioneer of the New Thought movement. The main objective of his teachings was to increase the level of consciousness of people and to aware people of their true selves. This book contains 12 lessons and each is followed by mantras for meditation (affirmations). If you’ve done some yoga, then move along to Yogi Ramacharaka and see what you can learn from one of the most fascinating minds of the past hundred years. This book is plenty of very profound thought, and you will not leave this fantastic work without spiritual growth.
Easy to read layout.
EXCERPT :
“The Science of Raja Yoga, to which this series of lessons is devoted, teaches, as its basic principle, the Control of the Mind. It holds that the first step toward Power consists in obtaining a control of one’s own mind. It holds that the internal world must be conquered before the outer world is attacked. It holds that the 'I’ manifests itself in Will, and that that Will may be used to manipulate, guide, govern and direct the mind of its owner, as well as the physical world. It aims to clear away all mental rubbish, and encumbrances—to conduct a 'mental house-cleaning, ’ as it were, and to secure a clear, clean, healthy mind. Then it proceeds to control that mind intelligently, and with effect, saving all waste-power, and by means of concentration bringing the Mind in full harmony with the Will, that it may be brought to a focus and its power greatly increased and its efficiency fully secured. ”