K’ai-chi Hsien-pen (Opening the Traces and revealing the Origin) is the function related to the Subtlety of the Original Effect. This is spoken of by Chih-i in terms of the dharma-teaching and the principle. The teaching of the Buddha in the Traces serve to reveal the Origin. By opening the Traces, the Origin as the principle is manifested. (Vol. 2, Page 447)
The Profound Meaning of the Lotus Sutra: Tien-tai Philosophy of Buddhism