William Walker Atkinson 
The Power of Concentration 

"The Power of Concentration" by William Walker Atkinson is a self-help book that explores the significance of focus and its impact on success and personal development. Atkinson offers practical techniques to enhance concentration and mental discipline. The book highlights the mind-body connection and the role of concentration in improving overall well-being. It also delves into the connection between concentration and creativity, as well as spiritual growth. Written in 1918, it continues to provide relevant guidance for improving focus and achieving goals.