Elder brother becomes the younger brother. The process to become a child of God.
Mankind makes the horse's bridle and also subjects the horse to wear it.
On the other hand, God only makes the Divine Principle bridle, but God cannot make mankind wear it. It is only possible for mankind to wear the Divine Principle bridle willingly by using human responsibility. Confess my sin to others and repent of my sin to God. As long as I hide my sin without confessing it and repenting I can never destroy my evil desire. Therefore, I can never separate, divorce form or liberate myself form satan.