And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
The mystery of being good and close to God is big and not hard to understand: God showed himself as a person, proved to be good by the Spirit, seen by angels, shared with non-Jews, believed in by people everywhere, and taken back to glory.