The key to progress in science is persistence and an open mind.

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

历史学家是回望过去的先知。

In other words, hold your horses when you're coming to judge people. You don't necessarily know what someone's truevalue is. That is an unknown part of them, and we shouldn't behave as though it is known. There is another source of solace and comfort for all this. When we think about failing in life, when we think about failure, one of the reasons why we fear failing is not just a loss of income, a loss of status. What we fear is the judgment and ridicule of others. And it exists.

每个家庭都是一个团结的小社会，自由和相互之间的感情是他们唯一的纽带。