The joy of solving a mathematical problem is unparalleled; it is a moment of pure intellectual triumph.

Respect your efforts, respect yourself. Self-respect leads to self-discipline. When you have both firmly under your belt, that's real power.

定言命令只有一条，那就是：要只按照你同时能够愿意它成为一条普遍法则的那个准则去行动。

石油的未来在于平衡经济增长与环境管理。

Food security begins with soil security.

The method of psychology must be rigorously empirical.