人尽皆知的真理是，一个财富殷实的单身汉，必定在寻找妻子。

农民是我们经济中唯一以零售价购买一切，以批发价出售一切，并支付双向运费的人。

The state, therefore, has not existed from all eternity. There have been societies that did without it, that had no notion of the state or state power. At a certain stage of economic development, which was necessarily bound up with the split of society into classes, the state became a necessity.

科学不仅仅是积累事实；它是关于理解背后的机制。