The best time to start building the life you want is now.

"Dreams don't work unless you do."

I don't care what people say about me. I know who I am.

墨翟我上没有侍奉国君的差事，下没有耕田种地的艰难，我怎么敢放弃读书呢？ 

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

动力学的方程在用变分法的语言表达时是完全的。