"Since happiness and effectiveness depend upon the kinds of thoughts we think, it is absolutely impossible to be happy if we think unhappiness-producing thoughts. One of the wisest men who ever lived was Marcus Aurelius, who said, "A man's life is what his thoughts make of it." If you put into your mind thoughts of fear, you will get thoughts of fear out of your mind. Fill your mind with resentment thoughts, and resentment attitudes will emerge. And in neither case, of course, can you find happiness-inducing thoughts. Whatever the condition of your mind, the Thought Conditioners I am going to suggest are so powerful that they will displace unhealthy thoughts. Indeed, displacement is the only way you can drive a thought from the mind. "- Norman Vincent Peale