The mind is nature's answer to the challenges of existence.
The world is full of magical things patiently waiting for our wits to grow sharper.
释义：通过分析物品的过剩与短缺，就能判断其价值的高低。这句话揭示了市场供求关系对价格的影响。
写作的艺术是发现你相信什么的艺术。