"Why should we think upon things that are lovely? Because thinking determines life. It is a common habit to blame life upon the environment. Environment modifies life but does not govern life. The soul is stronger than its surroundings."
"A great many people think they are thinking when they are merely rearranging their prejudices."
"Action may not always bring happiness, but there is no happiness without action."
"Belief creates the actual fact."
"If merely 'feeling good' could decide, drunkenness would be the supremely valid human experience."
"The greatest discovery of my generation is that a human being can alter his life by altering his attitudes."