Orison Swett Marden 
The Miracle of Thought [EPUB ebook] 

The book teaches the divinity of right desire; it tries to show that the Creator never mocked us with yearnings for that which we have no ability or possibility of attaining; that our heart longings and aspirations are prophecies, forerunners, indications of the existence of the obtainable reality, that there is an actual powerful creative force in our legitimate desires, in believing with all our hearts that, no matter what the seeming obstacles, we shall be what we were intended to be and do what we were made to do; in visualizing, affirming things as we would
like to have them, as they
ought to be; in holding the ideal of that which we wish to come true, and only that, the ideal of the man or woman we would like to become, in thinking of ourselves as absolutely perfect beings possessing superb health, a magnificent body, a vigorous constitution, and a sublime mind.