No rain， no rainbow.
不经历风雨，怎么见彩虹。
数学证明的美在于它的优雅以及它以清晰简洁的方式揭示潜在真理的方式。
"A book is a friend that never lets you down."
It’s not given to human beings to have such talent that they can just know everything about everything all the time. But it is given to human beings who work hard at it — who look and sift the world for a mispriced bet — that they can occasionally find one.
决心不过是记忆的奴隶，它会根据你的记忆随意更改。
The past is a foreign country; they do things differently there.
Love is the only thing that can fill the eternal emptiness of the human heart.