沉默并不总是缺席；有时它是最响亮的存在。

I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

君子做学问，是为了完善自己；小人做学问，是为了哗众取宠。

我预测美国人未来的幸福，如果他们能防止政府以照顾人民为借口浪费人民的劳动。