The most beautiful as well as the most ugly inclinations of man are not part of a fixed biologically given nature, but result from the social process which creates man.
Everything is hard before it is easy. The day before something is a breakthrough， it’s a stupid idea.
自由的代价是永恒的警惕。
真相还没穿上靴子，谎言已经跑遍全世界。
The progress of science relies not only on individual wisdom but also on collective cooperation and effort.