“Every man is what he is because of the dominating thoughts which he permits to occupy his mind. It is essential for you to encourage the positive emotions as dominating forces of your mind, and discourage—and eliminate negative emotions… First: I know that I have the ability to achieve the object of my definite purpose in life; therefore, I demand of myself persistent, continuous action toward its attainment, and I here and now promise to render such action. Second: I realize the dominating thoughts of my mind will eventually reproduce themselves in outward, physical action, and gradually transform themselves into physical reality; therefore, I will concentrate my thoughts for thirty minutes daily, upon the task of thinking of the person I intend to become, thereby creating in my mind a clear mental picture.”

- From Think and Grow Rich by Napoleon Hill