Now it is human nature to want to eat to ones fill when hungry, to want to warm up when cold, to want to rest when tired. These all are a part of peoples emotional nature. – Xun Zi

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. – Xun Zi

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. – Xun Zi