The study of mathematics is like air or gravity – it’s everywhere, even if you don’t see it.
译文：抬头望去，看不到那繁华的景象。所谓的繁华，不过是虚幻杂乱的，而世人却贪恋不已。
The most dangerous chemical in any plant isn't the one in the vats - it's complacency.
As to the gods, I have no means of knowing either that they exist or that they do not exist. For many are the obstacles that impede knowledge, both the obscurity of the question and the shortness of human life.
解释：局势安定的国家，常常是富足的；局势 动乱的国家，常常是贫穷的。
我们理解的两个操作，直觉和演绎，是我们获取知识时必须依赖的。