Hui-chi Hsien-pen (Converging 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 practice. All practices of the Buddha in the Traces can be traced back to the Origin. Therefore, when the Traces are made clear as the expedient means (denoting converging the Traces), the Origin is manifested (denoting revealing the Origin). (Vol. 2, Page 447)