因此，国家并非自古以来就存在。曾经有一些社会没有国家，对国家或国家权力毫无概念。在一定的经济发展阶段，这必然与社会分裂成阶级有关，国家变成了一种必要性。

技术进步不可阻挡，但它必须为人类服务。

The truth is rarely pure and never simple.

Mathematical intuition is like a muscle - it grows stronger with exercise.

The organism does not perceive stimuli, but objects in their environments.

The nightmare thought is that frightening people is the best way to get work out of them, and that somehow the crueler the environment, the more people will rise to the challenge. You want to think, who would you like as your ideal dad? And your ideal dad is somebody who is tough but gentle. And it's a very hard line to make. We need fathers, as it were, the exemplary father figures in society, avoiding the two extremes, which is the authoritarian disciplinarian on the one hand, and on the other, the lax, no-rules option.

我不必成为任何人的榜样。