What you know, you know, what you don't know, you don't know. This is true wisdom.
Everyone calls his son his son, whether he has talents or has not talents.
The way of Heaven and Earth may be completely declared in one sentence: They are without any doubleness, and so they produce things in a manner that is unfathomable.
Between friends, frequent reproofs make the friendship distant.
Benevolence is the characteristic element of humanity.
Study without reflection is a waste of time; reflection without study is dangerous.