过去是一个跟随你到任何地方的影子。
民主是唯一能够反映人类精神不屈不挠追求自由的制度。
The most pleasing of all sounds, that of your own praise.
Rigor in proof is what separates mathematics from all other sciences.
书是一面镜子:如果一只猿猴往里看,不太可能看出使徒的模样。