互联网是教育的强大工具，但它不能替代教师。

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

最重要的是我们对世界产生兴趣，并从我们的同胞中获取快乐。

"Mental life is a continuous adjustment to the environment."

反应倾向的强度取决于所接受的强化量。