The psychologist must avoid all forms of mental chemistry.

史记

Marxian Socialism must always remain a portent to the historians of Opinion — how a doctrine so illogical and so dull can have exercised so powerful and enduring an influence over the minds of men， and， through them， the events of history.

尽管儿童的举止有比较大的自由，但总的说来，他们给人一种非常有纪律的印象。

你知道的越多，你能知道的就越多。

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

写作是探索可能和可想象界限的一种方式。

The least I can do is speak out for those who cannot speak for themselves.