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Thinkers

Yi Hwang

Confucian · East Asia · 1501 to 1570

Korean scholar who taught that moral principle is distinct from feeling and must guide it, and who stressed inner reverence.

What it is

Yi Hwang (1501 to 1570), usually known by his pen name Toegye, was a Korean philosopher and Confucian scholar of the Joseon period. He was born near Andong and was thought a child prodigy.

He followed the Neo-Confucian teaching of Zhu Xi, in which the world is made of principle and material force, and he gave principle the higher place. He served at court for about forty years under four kings, and between posts returned again and again to study and teaching.

The main ideas

  • Principle and material force. Like Zhu Xi he saw the universe as built from two things, principle, the pattern and moral source of things, and material force, the physical side of things. He held that principle is the higher of the two, and he gave it priority over material force.
  • Four and Seven. In a famous debate with the scholar Ki Taesung, he took up a question from Mencius's philosophy. The four beginnings of virtue, such as compassion and shame, he tied to principle. The seven emotions, such as joy, anger and fear, he tied to material force. The Four-Seven debate became one of the best-known controversies in Korean Neo-Confucian thought.
  • Becoming a sage. In his Ten Diagrams on Sage Learning he set out the path by which a person can learn to become a sage. Each of its ten parts begins with a diagram and a text drawn from Zhu Xi or another leading authority, and ends with a short commentary.
  • A school. His view became the core of the Yeongnam school. Yi I, known as Yulgok, a younger contemporary, is treated on a page of his own.

What it looks like in practice

Imagine someone who flares up in anger at a colleague and is then ashamed. Toegye would not call the two feelings the same kind of thing. He would say that the shame has a different source from the anger, and that the work of a life is to nourish the one and keep a hand on the other. This is an illustration of his distinction, not his own words.

Books and moments

  • The civil service examinations. He passed the civil service examination with top honours in 1534 and went on to hold many government posts.
  • The Four-Seven debate. His exchange with Ki Taesung on the four beginnings and the seven emotions.
  • Ten Diagrams on Sage Learning. His main work, written late in his life as advice for the young King Seonjo.
  • Twelve Songs of Tosan. A cycle of poems in the sijo form, on a mountain place.
  • The academy. He set up a private Confucian academy, Dosan Seowon.

Questions and criticism

  • Two kinds of feeling? Can feeling be divided by its source, as he divided the four beginnings from the seven emotions? This is a question people still ask.
  • Can one outrank the other? He endorsed Zhu Xi's pairing of principle and material force, and it is fair to ask what it means for principle to rank above material force.
  • Scholar or official? He left office more than once and returned when the king asked. It is an open question whether he saw himself first as a scholar or as a servant of the state.

Close neighbours

The pages on Zhu Xi and on Mencius cover the teachers he built on. The page on Yi I covers the scholar whose school took a different view of principle and material force.

Written by epchē in our own words, and checked against independent sources on 29 October 2026. The sources are listed below.

Who they connect to

Influenced by

  • Zhu Xi · He took the teaching of Zhu Xi as the base of his thought and defended it.

Reacted against by

  • Yi I · He argued with the older scholar and denied that principle and feeling can move apart.

Other Confucian thinkers

Sources we used

  • Yi Hwang · Wikipedia, read on 29 October 2026
  • Yi Hwang · New World Encyclopedia, read on 29 October 2026
  • Korean Philosophy · Stanford Encyclopedia of Philosophy, read on 29 October 2026
  • Yi Hwang · Encyclopaedia Britannica, read on 29 October 2026
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