두곡 고응척의 공부론은 주자학적 수양론을 바탕으로 한다. 이는 경서를 중심으로 한 도문학 공부와 본연지성의 회복을 위한 존덕성 공부로 나뉜다. 이때 경서 『대학』은 공부론 체계의 완성에 중요한 역할을 한다. 이러한 두곡의 공부론은 그의 시문학 작품에 문학적 형상화를 통해 드러나게 된다. 두곡의 도문학 공부론은 『대학』을 필두로 한 四書 중심의 독서가 중심이었다. 그는 엄격한 교재의 선택과 독서를 통한 豁然貫通의 공부방법론을 보여준다. 또한 반복적 독서를 통한 의미의 완상으로 自得의 중요성을 설파하였다. 도문학과 함께 그의 공부론의 한 축인 존덕성 공부는 선천적으로 자신에게 내재한 본연지성의 회복을 목적으로 한다. 두곡은 대표적으로 근독의 방법론을 제시하였다. <존양부>, <근독부>, <태부>는 공통적으로 『대학』의 세계관을 내포하며 존덕성 공부가 개인적 수기의 완성을 너머 齊家·治國의 영역의 바탕이 됨을 설파했다. 두곡의 도문학·존덕성 공부는 兼善을 지향한다. 그는 『대학』에 담긴 도문학·존덕성 공부를 통해 자신과 타인의 완성, 즉 겸선의 추구를 보여주며 도덕성을 체인한 군자를 공부목표로 삼았다.
Doogok(杜谷) Ko Eung-cheok(高應陟) studied scholarly research and develop his mins based on Neo-Confucian theory of studying. This means study of lnner Cultivation based on the Confucian classics which contains the teaching of the sages and study of mind practice which tries to regain natural intelligence which is Honoring the moral nature(尊德性). His study of Honoring the moral nature`(尊德性) Following the path of study and inquiry(道問學) system is completed by 『Daehak』. Three core principle and eight articles which is key factor of 『Daehak』 influence Doogok(杜谷)`s study method and objective. As a result, Doogok(杜谷)`s theory of studying is written in his literature by imagery. His main idea is reading The Four Books based on 『Daehak』. His strict choice of good books shows well on acception of the books, only the Congucian classics, the books such as Taoism and Buddhism was firmly excluded. He`s <興萬物爲一賦> showed Understanding brightly and find enlightenment methodology by reading. Repeating reading using intensive and speed reading makes understand the meaning of the Confucian classics by heart and teach us to know the joy of self-satisfaction. Finding a enlightenment by self-satisfaction is not simple extension of knowledge. It makes people to have a deeper insight by connect the fragmented knowledge and discrimination of order of life. Doogok emphasis ``watchfulness over himself`` means abstain to keep people`s body and heart clean even though they are dlone. It is moral self cultivation method from 『Daehak』. He thought idleness is the most cautious one in study of ``Honoring the moral nature`` of ``watchfulness over himself``. Moreover, he argued idleness is reason of fallen of man and the country. All of <存養賦>, <謹獨賦>, <怠賦> has 『Daehak』`s idea. He claimed study of Honoring the moral nature` can not only cultivate personality but also govern a family(齊家) and rule the nation(治國). Study of ``Following the path of study inquiry`` and ``Honoring the moral nature`` pursue ``Sharing the Goodness``(兼善) by interaction His objective of study doesn`t based on personal knowledge or development of character. <用大學曲> and <入德門曲> showed completion of own and others by 『Daehak』`s Study of ``Following the path of study and inquiry`` and ``Honoring the moral nature`` which means pursuit of ``Sharing the Goodness`` (兼善). Also, reading by "Following the path of study and inquiry`` and study of ``Honoring the moral nature`` by ``watchfulness over himself`` made Doogok to target the man of virtue who has high morality.