The pace of change demands agility—both in thought and action.

Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

The relation between what we see and what we know is never settled.

诚信采矿意味着为子孙后代留下积极的遗产。

每一个挑战都是伪装的机遇——只要你有心发现。

【释义】国家如果没有正义，即使再强大也必然会灭亡。