Mankind’s existence is predicated upon the incarnation of soul in turn. In other words, each person gains a human life of the flesh upon the incarnation of their soul. After a person’s body is born, that life continues until the greatest limit of the flesh, that is, the final moment when the soul leaves its shell. This process repeats again and again with a person’s soul coming and going, and coming and going, thus maintaining the existence of all mankind. The life of flesh is also the life of man’s soul, and man’s soul supports the existence of man’s flesh. That is to say, each person’s life comes from their soul; it is not their flesh that originally had life. Therefore, man’s nature comes from their soul, not from their flesh.
from “A Very Serious Problem: Betrayal (2)” in The Word Appears in the Flesh