Xunzi （313？-238 BC）first proposed this idea as a way to cultivate rectitude. He believed that following human nature alone leads to endless contention over external objects, resulting in disruption and discord within communities. Ethics and morals are instilled in a person through nurture and education. By conforming to the demands of proper speech and conduct over a long period of time, a person gradually develops a sense of propriety and inner morality.

Heaped earth makes mountains where wind and rain are born; water pools into deep lakes where dragons dwell; many good deeds build moral character that creates discernment, and prepare for the heart and mind of a sage. (Xunzi)