Toegye is a thorough theorist on the basis of Neo-Confucianism, but he can be seen as a representative thinker who brought the philosophical characteristics mainly appearing in the history of Chinese philosophy, the cosmological characteristics centered on the concept of selfishness, to the theory of human nature and emotions, the realm of human nature and emotion. Toegye deepened this further, and made an unprecedented argument in the history of intellectuals, namely, Gobong and the four main emotions, regarding the understanding of the emotions called the four main emotions expressed in the pure nature and the emotions called the seven emotions expressed in the nature that was enshrined in the spirit and revealed through learning ten diagrams to become a saint 「聖學十圖」 and the Four Seven Debate that emotions must also be rational in the theory of nature, which is the core of Neo-Confucianism.
 In this paper, along with a conceptual analysis of Toegye's way of understanding emotions, we try to make creative transformation and expansion by applying it to the main concepts shown in the a Variorum of the Four Books(四書集註), which can be said to be the representative scriptures of Confucianism. There are often questionable passages among the contents that are generally introduced while reading librarians, but there are times when I wonder if it is not possible to present different judgments and thoughts due to the professional authority and weight. In fact, to mention it by leaps and bounds, violence against knowledge power is also implied in its source.
 However, Toegye's method of understanding emotions is of great significance in that it analyzes and corrects the method of understanding our daily thinking structure, rather than simply dealing with it as a subject of the Four-Seven Debate argument. Therefore, in this paper, by examining some of the major concepts of the librarian with Toegye's way of understanding emotions, that is, with Toegye's logical structure of thought, we can transform our thinking structure in dealing with things and situations into a thinking structure toward the truth, a true philosophy (Philo + Sophia) to try to convert to thinking.
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