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.

The end of law is not to abolish or restrain, but to preserve and enlarge freedom.

任何一个时代的统治思想始终都不过是统治阶级的思想。

学习数学的唯一方法就是做数学。

能源转型将需要前所未有的投资和合作水平。