The failure to cultivate virtue, the failure to examine and analyze what I have learned, the inability to move toward righteousness after being shown the way, the inability to correct my faults-these are the causes of my grief.

If I give a student one-fourth of what he should know, I expect him to get the other three-fourths himself, otherwise I do not want him as a student.

Reviewing what you have learned and learning anew, you are fit to be a teacher.

If an urn lacks the characteristics of an urn, how can we call it an urn?

Writing cannot express all words, words cannot encompass all ideas.

Wisdom, compassion, and courage are the three universally recognized moral qualities of men.

Never give a sword to a man who can't dance.