Zengzi

Chinese philosopher who was one of Confucius's most important disciples — traditionally credited with writing the Great Learning, which set the agenda for Neo-Confucian self-cultivation.

The Great Learning: the classic text of Confucian moral and political education — self-cultivation begins with the investigation of things and extends outward to family, state, and world. Filial piety (xiao) as the root of all virtue. The systematic connection between personal moral cultivation and political order.