True knowledge is when one knows the limitations of one's knowledge.

When things are investigated, then true knowledge is achieved; when true knowledge is achieved, then the will becomes sincere; when the will is sincere, then the heart is set right ; when the heart is set right, then the personal life is cultivated; when the personal life is cultivated, then the family life is regulated; when the family life is regulated, then the national life is orderly; and when the national life is orderly, then there is peace in this world.

A good man regards the root; he fixes the root, and ail else flows out of it. The root is filial piety; the fruit brotherly love.

Between friends, frequent reproofs make the friendship distant.

Worry not that no one knows you; seek to be worth knowing.

To study and at times practice what one has learned, is this not a pleasure?

The whole end of speech is to be understood.