The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
过去永远不会消逝，它甚至从未过去。
I am not an Athenian or a Greek，but a citizen of the world.
应该做官就做官，应该辞职就辞职，应该继续干就继续干，应该马上走就马上走。
