Once we dreamt that we were strangers。 We wake up to find that we were dear to each other。

金融模型的真正考验不在于它有多复杂，而在于它是否能很好地捕捉经济问题的本质特征。

Success is a journey, not a destination.

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.

No medicine cures what happiness cannot.