We can know a person by observing his behaviour, understanding the reasons for his actions and ascertaining his intentions. If we do this, how can we not know him?
A man who reviews the old so as to find out the new is qualified to teach others.
What you know, you know, what you don't know, you don't know. This is true wisdom.
A great man is hard on himself; a small man is hard on others.
A gentleman is calm and spacious: the vulgar are always fretting.
Silence is the true friend that never betrays.