There is no doubt that in exchanging a self-centered for a selfless life we gain enormously in self-esteem. The vanity of the selfless, even those who practice utmost humility, is boundless.

The strength of a response tendency depends on the amount of reinforcement received.

我们的目标是让消费者以最低的价格买到最好的商品。

科学不仅是理性的学科，也是浪漫和激情的学科。

你最好别吃了饭不付钱就跑……那些为了每小时三块钱辛苦工作的人不得不替你付账。