Don't stop when you're tired. Stop when you're done.
不要在你累的时候停下来。在你完成的时候停下来。
亲戚都不归附,也就不要对外办交际。 
"I don't think about the negatives. I just think about the positives."
Mathematics is the language in which the universe is written.
西方的生存取决于美国人重新确认他们的西方身份,以及西方人接受他们的文明独特性。