当一个人开始长得像他的父亲时，他就知道自己正在变老。
A man knows when he is growing old because he begins to look like his father.
A sound mind in a sound body, is a short, but full description of a happy state in this World: he that has these two, has little more to wish for; and he that wants either of them, will be little the better for anything else. Men’s happiness or misery is most part of their own making. He, whose mind directs not wisely, will never take the right way; and he, whose body is crazy and feeble, will never be able to advance in it.
翻译：物极必反是自然规律，做人做事留一分余地，不追求极致完美，才能避免盛极而衰。
The most elegant theories are useless if they don't correspond to reality.
