The only relationship that can make both partners happy is one in which sentimentality has no place and neither partner makes any claim on the life and freedom of the other.

I don't think about age. I think about life and living.

我不后悔做过的事，只后悔有机会时没做的事。

数学研究是一场没有终点的旅程。

写作的行为是一种勇气的行为。