Yuan-chüeh ching 

A Mahāyāna Buddhist scripture whose short Chinese title translates as ‘The Sūtra of Perfect Enlightenment’. This scripture probably originated in China itself around the beginning of the 8th century. In concise language, this scripture conveys philosophical and practical concerns rooted in the Chinese Buddhist currents of the day: Ch'an, T'ien-t'ai, and Hua-yen thought, along with instructions in meditation, monastic ritual, and confession (pāpa-deśanā). In the aftermath of the sudden-gradual controversy that had shaken the Ch'an establishment not long before the sūtra's composition, the text attempts a nuanced adjudication of the two positions. Speaking from within a deep state of trance, the Buddha, in response to questions put to him by advanced Bodhisattvas, takes a strict subitist position early in the work, but by the end has introduced gradualist teachings to correct an overly zealous attachment to subitist doctrine. This brief, one-fascicle text is document 842 in the Taishō collection.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)