Knowledge is represented in the mind as symbolic structures.

世界是一面伟大的镜子，我们是其中的倒影。

There are two freedoms - the false, where a man is free to do what he likes; the true, where he is free to do what he ought.

如果不能满足真正农民的需求，最先进的技术也毫无价值。

We are moving from an era of information scarcity to an era of information abundance, and the challenge is no longer finding information but managing it.