菩薩瓔珞本業經 1.32

1.32

"Buddha-son! Second is to cultivate immeasurable good deeds, that is to say, the four foundations of mindfulness: contemplating the body, feelings, mind, and phenomena. If all four are empty, the four inversions will not exist. Because one does not destroy provisional designations and all phenomena, that which is like an illusion or transformation refers to: the five aggregates of form, consciousness, feeling, conception, and volition; the six elements of consciousness and space; and the four great elements and all phenomena—they have no intrinsic characteristic and no other-characteristic, being like empty space.