"The Power of Concentration" by Theron Q. Dumont is a self-help manual written during the early 20th century. This book explores the importance of mental focus and concentration as key components to achieving personal success and mastering one's willpower. It presents practical lessons and exercises aimed at developing the reader's ability to concentrate effectively, thus enabling them to overcome various challenges and achieve their goals. The opening of this work sets the tone by emphasizing that concentration is fundamental to success in any endeavor. Dumont explains that everyone's thoughts and will can shape their destiny, and he encourages readers to practice concentration through daily exercises. He highlights the struggle between one's contrasting natures—one striving for growth and the other pulling back—and asserts that the nature which one focuses on will ultimately dictate their achievements. The introduction also offers a preview of the specific lessons to come, each designed to build upon the reader's capacity for concentrated thought and self-mastery. (This is an automatically generated summary.)