The secret of change is to focus all of your energy not on fighting the old, but on building the new.
改变的秘诀是将你所有的精力集中在建设新事物上，而不是与旧事物斗争。
The key to credible causal inference is not just the method, but how well the method fits the question at hand.
Everyone is in favor of free speech. Hardly a day passes without its being extolled， but some people's idea of it is that they are free to say what they like， but if anyone else says anything back， that is an outrage.
豁出去了，干吧！