Innovation is the ability to see change as an opportunity, not a threat.

The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.

数学不仅仅是一种工具；它是一种思维方式。

生活中最高尚和最美丽的事物不是被听到的，也不是被读到的，也不是被看到的，而是如果愿意的话，是被生活的。