Mathematics is a collaborative endeavor. No one does it alone.
数学是一项协作的努力。没有人可以单独完成。
"In the midst of winter, I found there was, within me, an invincible summer."
解释：情绪变化会影响身体生理反应，如贪心时口水增多，悲哀时流泪，体现了情绪与健康的关联。
最好的投资是那些能够创造未来的人。
你对消极的人回应越少，你的生活就越平静。
Our goal is to organize the world's information and make it universally accessible and useful.
No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.
