 Later, the forcible reply on the part of Kobong led T’oegye to concede that both Principle and Vital Force are actually present in the origination of all feelings when the heart-mind is activated, and his attempt to differentiate them in terms of stimulus had to be revised. As part of his response, T’oegye came up with a formula that recognized the interdependent roles of Principle and Vital Force but weighed them differently: in the case of the Seven Emotions, Vital Force gives issue and Principle follows it; in the case of the Four Sprouts, Principle gives issue and Vital Force accords with it (Yi Hwang [T’oegye] CW, Vol. 1, Book 16, 417b). Thus, instead of the original “separate issuance” theory, T’oegye now proposed a theory of “alternate issuance” (hobal 互發) by which Principle would be the one to issue in the case of the Four Sprouts, even though, traditionally, Principle was not considered a self-issuing agent within the Principle-Vital Force relationship (Chung 1995: 73). T’oegye at this point acknowledged that the Four and the Seven are all basic human feelings and that both involve Principle and Vital Force simultaneously when they issue. As he puts it,   