The "Second Sage" of Confucianism and the greatest Confucian thinker after Confucius. He systematically developed the "Theory of Innate Goodness," using the "Four Sprouts of the Mind" to demonstrate the internal basis of human goodness, internalizing Confucius's concept of "Ren" into a universal, innate moral sentiment. In political philosophy, he proposed the people-centered doctrine that "the people are supreme, the state next, the ruler last," endowing the populace with the moral right to revolution: "I have heard of the punishment of the solitary tyrant Zhou, not of the regicide of a ruler." His spirit of the "great man" who "cannot be corrupted by wealth, swayed by poverty, or bent by power," together with his cultivation of the "flood-like vital energy," inspired countless scholars and martyrs, becoming the core symbol of the Chinese scholarly ethos.
Personal name Ke, courtesy name Ziyu, a native of Zou (modern-day Zoucheng, Shandong) in the mid-Warring States period, descended from the Mengsun clan of Lu aristocracy. He lost his father in childhood, and his mother Zhang moved their residence three times for his education—first living near a cemetery, where she saw him imitating mourners and moved; next near a marketplace, where she saw him imitating merchants and moved again; finally near an academy, so he was immersed in ritual and musical education—the eternal model of maternal dedication known as "Mencius's mother moved three times." He studied under a disciple of Zisi, Confucius's grandson, deeply receiving the Confucian transmission. In middle age, he followed Confucius's example and traveled with disciples through various states, lobbying King Wei of Qi, King Yan of Song, Duke Wen of Teng, King Hui of Liang, and King Xuan of Qi, promoting the kingly way of benevolent governance. In an era of seven contending states and vertical-horizontal diplomacy, where rulers prized immediate military advantage, Mencius's "distant and impractical" ideals of kingly virtue were repeatedly rebuffed. In his later years he returned home and, with disciples Wan Zhang and Gongsun Chou, "ordered the Book of Odes and Book of History and expounded the meaning of Confucius," producing the seven chapters of the book Mencius. He died at eighty-four.
Ontologically, Mencius takes "Heaven" as the ultimate source of moral value: "He who fully exhausts his mind knows his nature; knowing his nature, he knows Heaven." Through inward introspection one can ascend to the heavenly Way and achieve unity of virtue with Heaven. In his theory of mind-nature, he proposes the doctrine that "human nature is good" as the Confucian orthodox position: the human heart innately possesses "four beginnings"—the mind of compassion, the mind of shame and dislike, the mind of deference and compliance, and the mind of right and wrong—just as humans have four limbs. When fully expanded, these become the four virtues of benevolence, righteousness, propriety, and wisdom. In political philosophy, he advances the people-oriented thought that "the people are most precious, the state next, the ruler is least important," advocating benevolent governance and the kingly way, holding that winning the hearts of the people wins the world. In self-cultivation, he champions "nourishing the vast, resolute qi"—"this qi is the greatest and most resolute; nourished with uprightness and not harmed, it fills the space between heaven and earth"—elevating moral cultivation to a sublime realm.
"The people are most precious; the state is next; the ruler is least important. — Mencius, "Jin Xin, Part II""
If human nature is inherently good, why are there still so many systemic evils in society? Is Mencius's "theory of innate goodness" overly idealistic?
Mencius uses the four beginnings to argue that human nature is innately good, while Rousseau takes the natural goodness of humans in the state of nature as his starting point. Both believe human nature is originally good and that civilization and institutions are the source of corruption—yet Mencius emphasizes inner cultivation while Rousseau emphasizes return to nature.
Is innate human goodness a prerequisite for social progress or a naive fantasy? Mencius and Rousseau, two thousand years apart, both believe in the purity of human nature. Is this humanity's highest ideal or its greatest self-deception?
Confucius takes "ren" as a practical guide, while Mencius provides the mind-nature foundation for "ren" through the doctrine of innate goodness, internalizing external behavioral norms into a priori moral ontology—a profound leap in Confucianism from behavioral ethics to philosophy of mind-nature.
Did Mencius's internalization of Confucius's "ren" as innate goodness deepen or deviate from Confucius's thought? Between inner mind-nature and outer ritual education, which is the more fundamental guarantee of morality?
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