自由之树需要经常用爱国者和暴君的鲜血来浇灌。
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Train people well enough so they can leave, treat them well enough so they don't want to.
【释义】天下的事,有那种远见卓识的人不一定能遇到合适的时机,而处在那个时代的人或许又没有那样的见识。