Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph.
The true journey is not about seeing new landscapes, but about having new eyes.
数学家研究纯数学不是因为它有用；他研究它是因为他喜欢它，他喜欢它是因为它美丽。
The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.
Every tree planted today is a legacy for generations we will never meet.