听不到门内嬉笑怒骂，可知这家治理严明；座右题写着格言名句，能知此人志趣高雅。
你无法回到过去改变开头，但你可以从现在开始改变结局。
A building should speak of its time and place, but yearn for timelessness.
The power of causal reasoning is that it allows us to predict the effects of actions we have never taken.