The funniest people are the saddest once
To know everything is to know nothing, but to know nothing is to know everything.
A good man will certainly also possess courage; but a brave man is not necessarily good.
True wisdom is knowing what you don't know
Reviewing the day's lessons. Isn't it joyful? Friends come from far. Isn't it delightful? One has never been angry at other's misunderstanding. Isn't he a respectable man?
If you know, say you know. If you don't know, say you don't know.