Theron Q. Dumont 
The Power of Concentration [EPUB ebook] 

This course of lessons will stimulate and inspire you to achieve success; it will bring you into perfect harmony with the laws of success. It will give you a firmer hold on your duties and responsibilities. All your real advancement must come from your individual effort. Success is assured when you are able to concentrate for you are then able to utilize for your good all constructive thoughts and shut out all the destructive ones. It is of the greatest value to be able to think only that which will be beneficial.