  Thus, on Yulgok, the Four and the Seven are not separate, but the former are rather a proper subset of the latter. Yulgok’s view is important because it pushes us deeper into the nature of aroused feelings. In the presence of good and bad feelings, what makes it possible to say that good feelings are preferable to bad feelings? Yulgok suggests that no real progress can be made if one separates the works of Principle and Vital Force in the relevant situations in life. As for the nature of Principle, Yulgok forcibly denies its transcendent and independent existence as well as its causal efficacy. While Principle “pervades” (itong 理通) and Vital Force “delimits” (kiguk 局), Principle is in and of itself causally impotent and acquires its agency only when it follows Vital Force (Yi I [Yulgok] CW, 10.26a). However, it does not follow that Principle and Vital Force are for this reason independent from each other. Despite Principle’s role as the universal order structuring norms, Vital Force is the only particularizing power that moves things on the model of Principle. Yulgok thus claims:    