凡是天下的祸患，掠夺与怨恨，之所以能出现，原因就在于人们不相爱。因此，仁义的人认为这是不对的。 

Changing the destructive things you say to yourself when you experience the setbacks that life deals all of us is the central skill of optimism.

The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways.

Innovation is not just about creating something new, but about making what exists better.

The worth of a state， in the long run， is the worth of the individuals composing it.

En la oscuridad, las palabras son la luz que nos guía.

数学中最重要的是提出正确的问题。