The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

The spread of liberal democracy and the integration of the world economy have created a situation in which the major powers are no longer willing to risk war with one another.

天下的老百姓如果都向上统一于天子，而不向上统一于天的意志，那么灾祸就还没有完全离去。