The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.
生命中你有许多机会闭紧嘴巴。
你越爱自己，就越不会容忍无意义的事。
The past is always tense, the future perfect.
Two roads diverged in a wood, and I—I took the one less traveled by, And that has made all the difference.