Better known in China as "Master Meng", Mencius was a fourth-century BC Chinese thinker whose importance in the Confucian tradition is second only to that of Confucius himself. In many ways, he played the role of St. Paul to Confucius' Jesus, interpreting the thought of the master for subsequent ages while simultaneously impressing Confucius’ ideas with his own philosophical stamp. He is most famous for his theory of human nature, according to which all human beings share an innate goodness that either can be cultivated through education and self-discipline or squandered through neglect and negative influences, but never lost altogether.