There is only one road in the world that no one but you can take. Where does it lead? Don't ask, just walk.

"We do not write because we want to; we write because we have to."

The fact is that women have more freedom and opportunity in America today than ever before.

模型的目的是足够简单以便理解和使用，但又足够复杂以捕捉系统的基本特征。

智者云：“话说出口之前，请三省自问。第一层自问，“信息是否为真？”，第二层自问：“有必要说么？”第三层自问：“是出于善意的么？”

世界并不友善，但它是正确的。