"The world is not a place for self-expression, but for self-control."

"The truth is, we are all controlled by the world in which we live."

"Man is a machine in the sense that he is a complex system behaving in lawful ways, but the complexity is extraordinary."

"The highest possible achievement is to be able to live for the present moment, fully and completely."

"The future of man is not in the stars but in the control of his own behavior."