By gaining the people, the kingdom is gained; by losing the people, the kingdom is lost.

To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.

If your plan is for one year plant rice. If your plan is for ten years plant trees. If your plan is for one hundred years educate children.

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

If you think in terms of a year, plant a seed; if in terms of ten years, plant trees; if in terms of 100 years, teach the people.

To be wealthy and honored in an unjust society is a disgrace.

Things that are done, it is needless to speak about...things that are past, it is needless to blame.