In Buddhist scriptures, “consummate interfusion” has two meanings: (1) the original state of all things, which are interfused with and governed by each other, and (2) a viewpoint on truth that argues against adherence to any judgment. The Tiantai School interprets “consummate interfusion” in this way: it develops the concept of satyadvaya (the two truths) into “the three levels of truth”– the empty truth, the false truth, and the middle-way truth. According to this theory, one shall neither descend into nor detach oneself from the two extremes: emptiness and existence. Such non-duality demonstrates the nature of consummate interfusion. The Huayan School offers another interpretation with “the consummate interfusion of six aspects.” It argues that all things can be judged from six aspects: the general, the particular, the identity, the differentiated, the integrated, and the destructive aspect. Although they appear as three opposites, these aspects, consubstantial with one another, transcend conceptual opposition.

The distinction lies in the subtlety of dharma. The superficial dharma deals with the three truths separately, while the subtle one perfectly interfuses them. (Shi Zhiyi: Profound Meaning of The Lotus Sutra of the Wonderful Dharma)