“Happiness and freedom begin with a clear understanding of one principle: Some things are within our control, and some things are not. It is only after you have faced up to this fundamental rule and learned to distinguish between what you can and can't control that inner tranquility and outer effectiveness become possible.”

“You can listen to what people say, sure. But you will be far more effective if you listen to what people do.”

“It's not what happens to you, but how you react to it that matters.”

“Progress is not achieved by luck or accident, but by working on yourself daily.”

“When something happens, the only thing in your power is your attitude toward it. It is not the things that disturb us, but our interpretation of their significance. Things and people are not what we wish them to be nor are they what they seem to be. They are what they are.”

“Suffering arises from trying to control what is uncontrollable, or from neglecting what is within our power.”

“It is impossible for a man to learn what he thinks he already knows.”