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Mencius (Mengzi): human nature is good
c. 372–289 BC· Philosopher· Asian traditions
Mostly agreedGood evidence; some details uncertain.
Chinese Confucian thinker who argued that human nature is good, because everyone is born with 'sprouts' of virtue.
See it on the Philosophy map →The idea
Mencius (Mengzi 孟子) offered a test: anyone who suddenly sees a child about to fall into a well feels alarm and compassion, not for reward or reputation. That reflex is one of four innate 'sprouts' (si duan 四端): compassion grows into humaneness (ren 仁), shame into righteousness (yi 義), deference into propriety (li 禮), and the sense of right and wrong into wisdom (zhi 智). Sprouts need patient cultivation, like crops. In politics, the people matter most and tyrants may be overthrown.
Why it matters
His optimistic view became Confucian orthodoxy after Zhu Xi made the Mencius one of the Four Books in the 12th century, shaping Chinese and Korean ethics and civil-service exams.
Legacy and sources
The Mencius, seven books of conversations compiled by him or his disciples, survives; Sima Qian's Records of the Grand Historian (c. 90 BC) gives a short biography.
Still debated
His dates and teachers are uncertain, and scholars debate whether 'human nature is good' means it starts good or only has a tendency to goodness.
Connections (4)
▸Confucius (Kongzi) was defended and extended by Mencius (Mengzi): human nature is goodWell documented
The connection
Born about a century after Confucius died, Mencius saw his mission as defending him against rivals: the Mohists' impartial love and Yang Zhu's self-interest. He filled gaps. Confucius said only that people are 'close by nature, far apart by practice', so Mencius supplied a theory that nature is good, and turned ren (仁, humaneness) into a program of humane government.
When and how
Late 4th century BC in the states of Zou, Qi and Wei; tradition says Mencius studied under pupils of Zisi, Confucius's grandson.
How we know
The Mencius quotes Confucius often and calls him the greatest of sages; Sima Qian records the teaching line through Zisi's school.
Debates and open questions
The lineage through Zisi is traditional, not certain; scholars also debate whether Mencius's 'good nature' faithfully extends or departs from Confucius.
▸Mencius (Mengzi): human nature is good answered "good" to Is human nature good or bad?Well documented
The connection
Mencius answered 'good', meaning people are born with the beginnings of virtue. Against Gaozi, who said nature is like water that flows east or west as channelled, he replied that water always flows downhill, as people naturally tend toward goodness. Evil comes from damage, like Ox Mountain, once wooded, stripped bare by axes and grazing.
When and how
The states of Qi and Teng, around 320 BC, in recorded debates with Gaozi and conversations with rulers.
How we know
Books 2A and 6A of the Mencius preserve the arguments, including the child at the well and Ox Mountain; Xunzi later attacks this view by name.
Debates and open questions
Whether Mencius claimed people are actually good or only have a tendency to be, and whether his water analogy proves anything.
▸Mencius (Mengzi): human nature is good was opposed by Xunzi: human nature is badWell documented
The connection
Xunzi, writing a generation or two after Mencius, made opposition to him a central theme. He accused Mencius of confusing nature, what we are born with, with what we achieve by effort, and argued that if people were naturally good, sages, rituals and laws would be unnecessary.
When and how
Qi and Chu, 3rd century BC, after Mencius's death; Xunzi argued against ideas still taught at the Jixia academy, where he presided.
How we know
The Xunzi names Mencius repeatedly, quoting his claim that nature is good, and the essay 'Against the Twelve Philosophers' criticizes him and Zisi.
Debates and open questions
Whether the two really disagree: both say anyone can become a sage through learning, and they may simply define 'nature' differently.
▸Mencius (Mengzi): human nature is good supplied the "four sprouts" debated in The Four-Seven Debate (Toegye and Gi Daeseung)Well documented
The connection
Mencius's four sprouts, the innate roots of compassion, shame, deference and moral judgment, were set beside the 'seven feelings' (joy, anger, sorrow, fear, love, hatred, desire) of the Book of Rites. Korean scholars asked whether the sprouts arise from principle (li 理) and the feelings from material force (gi 氣), or both from both.
When and how
Joseon Korea, 1559–1566, in letters between Toegye (Yi Hwang, 이황) and the younger scholar Gi Daeseung; renewed in 1572 by Yulgok and Seong Hon.
How we know
Their letters survive and quote Mencius's four-sprouts passage and Zhu Xi's commentary directly.
Debates and open questions
Whether the debate was a real philosophical advance on Zhu Xi or mainly a dispute over wording, and how far it fed later Korean factions.