勇气不是没有恐惧，而是战胜恐惧。

The end of history is not the end of events, but the end of the evolution of human political and social institutions.

True leadership means making tough decisions today for a better tomorrow.

The best songs come from a place of honesty and vulnerability.

在数学中，解决问题的旅程与解决方案本身同样重要。