The book teaches that man need not be the victim of his environment, but can be the master of it. This work shows how man can stand porter at the door of his mind, admitting only his friend thoughts, only those suggestions that will produce joy, prosperity; and excluding all his enemy thoughts which would bring discord, suffering, or failure. It teaches that "your ideal is a prophecy of what you shall at last unveil," that "thought is another name for fate," that we can think ourselves out of discord into harmony, out of disease into health, out of darkness into light, out of hatred into love, out of poverty and failure into prosperity and success.Dr. Orison Swett Marden (1848-1924) was an American inspirational author who wrote about achieving success in life and founded SUCCESS magazine in 1897. He is often considered as the father of the modern-day inspirational talks and writings and his words make sense even to this day. In his books he discussed the common-sense principles and virtues that make for a well-rounded, successful life.