This article is meant to inquire on the foundation and essence of "propriety" and review the "internal tension" within the practice of propriety throughout history. First, we will examine, from a macro perspective, the approaches to this tension within the practice of propriety adopted in all the different periods and dynasties before reflecting on the value and meaning of this problem consciousness. Secondly, we will trace to its source and investigate all the clues provided in Analects. In terms of methodology, revolving around the physical and mental cultivations, this article explores the existential significance of one's body, studies the foundation of "propriety"-including the collective ideal of moral life-contemplates the ideals of bringing the heaven and earth to order and harmony as proposed by classic philosophy, and reflect on how to avoid the stiffness of propriety and figure out the solution to the internal tension within the practice of propriety.