Happiness is not having what you want, but wanting what you have.
幸福不是拥有你想要的,而是想要你拥有的。
The pursuit of mathematical truth is a pursuit of beauty, elegance, and simplicity.
Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.
"We are all in the gutter, but some of us are looking at the stars."