The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
孔子说：“我想不说话。”子贡说：“您如果不说话，谁教我们呢？”孔子说：“天说过什么？天不说话，照样四季运行，百物生长，天说过什么？”
It is a common experience that a problem difficult at night is resolved in the morning after the committee of sleep has worked on it.