Since the nature of people is ...

Since the nature of people is bad, to become corrected they must be taught by teachers and to be orderly they must acquire ritual and moral principles.

Quotes from the same author

A person is born with feelings of envy and hate. If he gives way to them, they will lead him to violence and crime, and any sense of loyalty and good faith will be abandoned.
If the gentleman has ability, he is magnanimous, generous, tolerant, and straightforward, through which he opens the way to instruct others.
If there is no dull and determined effort, there will be no brilliant achievement.
Therefore, a person should first be changed by a teacher's instructions, and guided by principles of ritual. Only then can he observe the rules of courtesy and humility, obey the conventions and rules of society, and achieve order.
Human nature refers to what is in people but which they cannot study or work at achieving.