Good deeds do not cancel out bad, nor do bad deeds erase good.

The most important political development of the last half century has been the spread of liberal democracy around the world.

最大的快乐就是没有快乐，最大的荣 誉就是没有荣誉。指快乐和荣誉都是相对而言的。

To be human is to be in the world, and to be in the world is to be in time.

The great challenge of our time is to build institutions that can manage the complexity of modern societies.