“(1)把数学当作速记语言，而非探讨的工具。(2)用这个方法一直到把想法完全记下为止。(3)将之译为英文。(4)举例说明为何这些想法在真实生活里重要。(5)把数学烧掉。(6)如果你做不到(4)，就把(3)烧掉。我经常做这最后一点。” [I had] a growing feeling in the later years of my work at the subject that a good mathematical theorem dealing with economic hypotheses was very unlikely to be good economics: and I went more and more on the rules - (1) Use mathematics as a shorthand language, rather than an engine of inquiry. (2) Keep to them till you have done. (3) Translate into English. (4) Then illustrate by examples that are important in real life. (5) Burn the mathematics. (6) If you can't succeed in (4), burn (3). This last I did often. — A History of Economic Theory and Method: Sixth Edition， [1]
