唯一的限制是你自己设定的限制。

Millions saw the apple fall, but Newton asked why.

真正的音乐来自于内心，而不是技巧。

粮食安全始于土壤安全。

That “democracy” is a somewhat vague term which I cannot define precisely. We ought to say, therefore: “I am fairly certain that it is a good thing if a government has something of the characteristics that are common to the British and American Constitutions,” or something of this sort.

The real challenge is to create something that has meaning beyond its function.

被视为行为系统的人类其实相当简单。我们行为表面上的复杂性很大程度上反映了我们所处环境的复杂性。