有些事情发生了却没有留下可察觉的痕迹，没有被谈论或记录下来，尽管如果说后续事件漠不关心地继续下去，就好像这些事情从未发生过一样，那是非常错误的。
There are things that happen and leave no discernible trace, are not spoken or written of, though it would be very wrong to say that subsequent events go on indifferently, all the same, as though such things had never been.
Psychology is a science, and teaching is an art; and sciences never generate arts directly out of themselves.
译文：有道义的财物可以去谋取，没有道义的钱不能强求。赏析：君子爱财，取之有道。赚钱不可耻，但要走正道。那些来路不正的意外之财莫贪，人要是贪小便宜，终究会吃大亏的。
The mind is the organ of adaptation par excellence.