“可能”問“不可能”道：“你的住所在何處？”對方答道：“在無能者的幻夢中?！?
Ask the Possible of the Impossible,“Where is your dwelling-place？”“In the dreams of the impotent.”comes the answer.
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
【譯文】君子成全別人的好事，不幫助別人做成壞事。小人與此相反。
We cannot know the cause, and therefore the effect, by reason alone.