In dreams, you don't need to make any distinctions between things. Not at all. Boundaries don't exist. So in dreams there are hardly ever collisions.

The power of abstraction is that it allows us to ignore details that are not relevant to the task at hand.

The world is my country, all mankind are my brethren, and to do good is my religion.

The universe is not only stranger than we imagine, it is stranger than we can imagine.

我不相信市场时机。我相信以好的价格买入好的公司。

经济学家的角色既是科学家，又是工程师。

多线进化是对因对不同环境的不同适应而产生的文化多样形式的研究。