Xun Zi

Human nature is evil, and goodness is caused by intentional activity. A person is born with a liking for profit. If he gives way to this, it will lead him to quarrels and conflicts, and any [acquired] sense of courtesy and humility will be abandoned. 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 [acquired] sense of loyalty and good faith will be abandoned. A person is born with desires of the eyes and ears, and a liking for beautiful sights and sounds. If he gives way to them, they will lead him to immorality and lack of restriction, and any [acquired] ritual principles and propriety will be abandoned. Thus, anybody who follows this nature and gives way its states will be led into quarrels and conflicts, and go against the conventions and rules of society, and will end up a criminal. 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.