With regard to the ten functions in the door of the Origin, they are also regarded by Chih-i to express the Ten Subtleties in the Origin. If the ten functions in the Traces can be taken as revealing the relationship between the Three Vehicles and the One Vehicle, then the ten functions in the Origin can be taken as revealing the relationship between the Traces and the Origin. This indicates that both groups of the Ten Subtleties concern the Ultimate Truth that consists of the Relative and the Ultimate. Although the ten functions of the Traces and of the Origin are spoken of by Chih-i in different terms, they contain the same teaching of the Buddha in conveying the Ultimate Truth or True Reality. The Three Vehicles and the Traces are taken as the Relative Truth, and the One Vehicle and the Origin the Ultimate Truth. The similar terms of these two groups of the ten functions prove Chih-i’s theory that the Buddha’s teaching is consistent and coherent. Regardless of whether it is relative or ultimate teaching, Chih-i stresses that the Buddha’s real intention is to reveal the One Buddha vehicle that is already present in the Origin. (Vol. 2, Page 446-447)