This text, taken from "As a Man Thinketh" by James Allen, describes how our thoughts shape our character, circumstances, health, and achievements. The argument is that thoughts are the cause of our external reality and internal state. The author states that focused thinking is essential for achievement, and that peace is the result of self-control and understanding the laws of thought. Ultimately, the text emphasizes that self-control and right thinking lead to mastery over life and serenity.