Empirical evidence should drive economic policy, not just ideology.

In times of crisis, true leadership is measured by actions, not words.

In a world filled with hate, we must still dare to hope. In a world filled with anger, we must still dare to comfort. In a world filled with despair, we must still dare to dream. And in a world filled with distrust, we must still dare to believe.

Mental activity is always directed toward some end.

对心灵的研究必须摆脱一切先入为主的观念。

A quarry manager needs the precision of an engineer and the vision of a poet.

"The role of the infinitely small in nature is infinitely large."