学古而不泥古，师古而不袭古。
学习古人但不拘泥于古人，效法古人但不抄袭古人。
词语就像钥匙，选对了就能打开任何一扇门。
在经济学中，魔鬼往往藏在细节里。
逻辑与数学原理之所以普遍为真，只不过是我们从不允许它们为假。
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
