水太清了就会见不到鱼，人太精明了就没有朋友。冠冕的玉旒，是用来遮蔽视线；用丝棉塞耳，是为了减弱听觉。

The history of mathematics is a testament to the ingenuity and creativity of the human mind.

债券市场是经济健康的最终指标。

Our heroes are human heroes. That's a very new situation. Most other societies have had, right at their center, the worship of something transcendent: a god, a spirit, a natural force, the universe, whatever it is -- something else that is being worshiped. We've slightly lost the habit of doing that, which is, I think, why we're particularly drawn to nature.