心理学家必须是一个冷静的观察者。
拓扑学是对图形在任何变形下保持不变的性质的研究。
智慧是快乐的源泉。
我不是天才，我只是一个努力工作的人。
教师在学校里不是为了强加某些观念或形成某些习惯，而是作为社区的一员，选择影响孩子的因素，并帮助他适当地回应这些影响。
The greatest investment you can make is in yourself.
Energy independence is not just a goal; it's a necessity for national security.
Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make the big choices in life. Because almost everything—all external expectations, all pride, all fear of embarrassment or failure—these things just fall away in the face of death, leaving only what is truly important. Remembering that you are going to die is the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no reason not to follow your heart.
Profitability and environmental responsibility are not mutually exclusive—they go hand in hand when done right.