入门统计学课本一开始讲的几个要点之一，就是相关性不是因果性。这也是最先被忘记的要点之一。
One of the first things taught in introductory statistics textbooks is that correlation is not causation. It is also one of the first things forgotten.
读书学习的人要像闺中少女一样小心谨慎对待别人。做官之后如同过了门的媳妇，要使百姓能各有所养。年老辞官后如同慈祥的老太婆，要担负起教育后人的责任。
The world is full of obvious things which nobody by any chance ever observes.
"The past is always carried into the present by small things."