Abstract
In this article I have re-examined the stupa inscription for Songyuan Chongyue (_??__??__??__??_), which was written by Lu You (_??__??_) and included in his Weinan Anthology. According to the inscription, Songyuan was enlightened upon hearing Mi'an Xianjie's (_??__??__??__??_) instructions on Muan Anyong's (_??__??__??__??_) phrase, “opening one's mouth is not on the tongue.” Muan Anyong was a second-generation successor to Dahui (_??__??_). Afterward, this phrase came to represent Songyuan's teaching. The phrase's meaning is examined on the basis of two of his general lectures (_??__??_), in which both the experience of great enlightenment based on the koan and having an encounter with a good Zen master are important. Thus this koan becomes referred to as “a single koan that exhausts the great earth” and “the koan of the immediate manifestation of one's original allotment.”
