The Jade Pure, the Most Pure, and the High Pure Realms represent three levels of enlightenment. To rise to the Jade Pure Realm is to attain wu-chi, the highest form of enlightenment. This is complete union with the Tao. To enter the Realm of the Great Pure is to exist in a state in which subject and object are differentiated but are integral parts of the Tao. It is a lesser form of enlightenment. To attain the Realm of the High Pure is to exist in harmony with nature and humanity, to live according to the laws of nature, and to embody the highest virtues of humanity. This is the lowest form of enlightenment.
Source: commentary on T'ai Shang Ch'ing-ching Ching, written in Six Dynasties Era (220-589 AD), p 7
Contributed by: Zaady