This subject is a mystery to be known only by revelation. It is a secret that has been kept hidden from the beginning of time. Where there is no mystery, where there is no end from the beginning, there is no challenge, no place for imagination, or any room for faith or hope. But when it pleased God, in the fullness of time, to make it known to his apostles, those whom he called and incorporated into his own risen body, they are sent to tell the story of the gospel of God.