이언적 수고본 일괄-대학장구보유(李彦迪 手稿本 一括-大學章句補遺)는 조선 중종 때의 유학자이며 정치가인 회재 이언적(1491∼1553)이 명종 2년(1547)에서 명종 8년(1553) 사이에 직접 쓴 저술 가운데 하나이다.

이언적은 조선 중기의 성리학자로 24세에 문과에 급제하여 벼슬길에 나갔다. 김안로를 등용하는 것을 반대하다가 귀양을 가기도 했으며, 김안로 일파가 몰락한 뒤 다시 정치에 나섰고, 후에 백성들에게 선정을 베풀어서 그의 송덕비가 세워지기도 했다. 1547년 조작된 양재역벽서사건에 연루되어 강제로 유배되었고, 그곳에서 많은 책을 썼으나 63세의 나이로 세상을 떠났다. 조선시대 성리학을 세우는데 선구적 인물로, 후에 영의정에 추증되고, 시호는 문원이다.

회재 이언적이 전체를 직접 썼으며, 책 끝에는 노수신의 발문이 있다. 송나라의 주희가 정한『대학장구』와는 부분적으로 다른 의견을 제시한 것으로 주자를 신성시하는 당시 유학사상에 매우 이채로운 저술이다.

Daehakjanggu boyu (Addendum to the Great Learning by Chapter and Phrase) is one of the works by Yi Eon-jeok (pen-name: Hyojae, 1491-1553), a Neo-Confucian scholar and a statesman of mid-Joseon who lived in King Jungjong’s reign, that were written during the six year period between 1547 (the 2nd year of King Myeongjong’s reign) and 1553 (the 8th year of King Myeongjong’s reign). Yi Eon-jeok entered the government at the age of twenty-four after successfully passing the civil service examination. At one point of his career, he was sent into exile for objecting to the appointment of Kim An-ro to a government office. Later, when Kim An-ro and his faction were ousted from power, Yi Eon-jeok returned to Joseon’s political scene. As a local official, he was loved by the people of his jurisdiction who erected a monument to praise his wise administration. In 1547, he was again sent into exile, this time, for his supposed involvement in an affair where posters critical to the royal house and the government were put up in Yangjaeyeok. He authored numerous books in his place of exile before his death at the age of sixty-three. A larger-than-life figure in Joseon’s Neo-Confucian studies, Yi Eon-jeok was posthumously appointed yeonguijeong (chief state councilor) and was bestowed upon the title “Munwon.” The full manuscript, from beginning to end, was written by the hand of Yi Eon-jeok, except the postscript by No Su-sin at the end. In Daehakjanggu boyu, Yi Eon-jeok expresses views on the Great Learning that are, in some cases, quite different from the ones Zhu Xi voiced in his Da xue zhang ju (The Great Learning by Chapter and Phrase). These dissenting views make Daehakjanggu boyu all the more interesting, given that it was written at a time when the Song-dynasty scholar was worshipped like a quasi-deity, and no one would dream of disagreeing with him.

朝鲜中宗时期的儒学家、政治家晦斋李彦迪（1491～1553）于明宗2年（1547）至明宗8年（1553）间亲笔书写的著述之一。晦斋李彦迪亲笔书写了此书的全部内容，书末尾有卢守慎的跋文。此书提出了部分与宋朝朱熹所著的《大学章句》不同的见解，是视朱子为神圣的当时，儒学思想上别具一格的著述。

朝鮮時代中宗の時の儒学者であり、政治家であった晦斎李彦迪(1491～1553)が明宗2年(1547)から明宗8年(1553)にかけて、自ら書いた著述の一つである。晦斎李彦迪が全体を自ら書き、本の終わりには盧守慎の後書きがある。宋の朱喜が決めた『大学章句』とは部分的に違った意見を提示したもので、朱子を神聖視する当時の儒学思想を考えると、大変独特な著述である。