長阿含經 18.p29

18.p29

“Ascetics and priests use various methods to enter a fixed samādhi of mind. Following that samādhi of mind, they visualize the removal of the external impurities of skin, muscle, and white bones. Once again, they investigate consciousness. Consciousness will be in a later life and not exist in the present life. The present life ended, but the later life won’t have ended. It’ll be freed from the present life but not freed from the later life. This is the fourth attainment of vision.