이이와 관련된 글을 집대성한 시문집으로, 1749년 홍계희에 의해 금속활자인 율곡전서자栗谷全書字로 간행되었다. 이 책의 권27에는 이이가 1580년(선조 13) 저술한 유학 입문서이자 아동 교육용 책인 『격몽요결』이 수록되어 있다. 당시 조선에서 널리 읽혔던 『소학』이 우리의 실정에 맞지 않는다고 생각하여 새롭게 집필한 교육 지침서다. ‘격몽’은 『주역周易』에서 따온 ‘어리석음을 깨우치다’라는 뜻이며, ‘요결’은 ‘중요한 비결’이란 의미다.

This collection of poetry and prose related to Yi I was published in 1749 by Hong Gye-hui, utilizing a movable metal type called Yulgokjeonseoja. Volume 27 of the book contains the Gyeongmong yogyeol, an introduction to studying Confucianism and a book designed for children’s education, authored by Yi I in 1580 (the 13th year of King Seonjo’s reign). This work represents a newly crafted educational guidebook, as Yi I believed that Small Learning, widely read in Joseon at the time, was not suitable for the Korean context. The term gyeongmong means “to enlighten the ignorant,” taken from the Book of Changes, and yogyeol means “essential secrets” or “important methods.”