The purpose of this article is to analyze the political philosophy of Toegye in relation to the Libal(理發, activity of Li in Human mind)·Lidong(理動, activity of Li in cosmology)·Lido(理到, activity of Li in object of recognition) theory, and to reveal the practical implications contained therein. In Neo-Confucianism, the theory of selfcultivation and Human Nature(心性) are justified from the theory of ligi(理氣), which is their metaphysical basis, and the theory of selfcultivation and Human Nature again leads to the political philosophy. These characteristics need to be considered in the analysis of Toegye's political philosophy. As is well known, Libal·Lidong·Lido refers to the activity of Li in the theory of selfcultivation, Human Nature, and political philosophy. Therefore, in this paper, the meaning of Li in each theory is analyzed and its implications in political philosophy are examined. Toegye's political philosophy can be summarized as Sage Learning in one word, and Sage Learning is again summarized as the selfcultivation of the monarch. The superficial form of this can be evaluated as showing a passive attitude in political participation while inheriting the moral politics of Neo-Confucianism. However, in view of the characteristics of Li-Hak(理學) that insisted on activity of Li, his Sage Learning has practical implications for establishing a social order based on pure li.