江河之水，非一源之水也；千镒之裘，非一狐之白也。
江河的水之所以浩浩荡荡，并非只由一个源头流出来；无比珍贵的皮衣，并非只由一只狐狸腋下的毛皮所能制成。
You can't knock on opportunity's door and not be ready.
所有老人共同的大秘密是，在七八十年里，你真的没有改变。你的身体变了，但你一点都没变。
衡量一个人的标准是他如何运用权力。
It is not, nor cannot come to good. But break, my heart, for I must hold my tongue.
Mathematical intuition often guides the development of algorithms, but it is the rigorous proof that ensures their correctness and efficiency.