我从未认识过任何人是他们看起来的样子；或者至少，只是他们看起来的样子。
I've never known anyone who was what he or she seemed; or at least, was only what he or she seemed.
To be free is not to have the power to do anything you want, but to have the power to do what is right.
I’ve always been an optimist and I suppose that is rooted in my belief that the power of creativity and intelligence can make the world a better place.
数学之美不仅在于其抽象的优雅，还在于其建模和解决现实世界问题的深刻能力。
我不需要理由去爱自己。
一个思想的价值在于它对行为的后果。