The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labor which is necessary for its production, and not on the greater or less compensation which is paid for that labor.

最好的解决方案往往来自倾听——倾听海洋、倾听鱼类，以及依赖它们的社区。

真正的数学家始终是学生，永远在学习。