Writing under the pen-name Toegye - meaning "Retreating Creek" - what sage and scholar was the founder of Neo-Confucism?

With a pen-name meaning "Retreating Creek," Yi Hwang was a Joseon dynasty Neo-Confucist. The sage taught that i and gi were the driving forces of the universe. He once wrote: "The ancients see me not, nor I, the ancients, Though I see the ancients not, the Way they trod is before me, Their Way before me, can I but follow.“

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