Volume II, THE PEOPLE OF GOD IN THE OLD TESTAMENT, helps us to study the seal of God in his elects to the Eternal Life. In the Old Testament, God FROM HEAVEN forgave sins with a condition: the sinner must sacrifice to God a victim animal. In the New Testament, to accept the sacrifice of the Victim Jesus on the Cross forgives sins with a condition: sinners must confess their sins to a priest who belongs to the Apostolic Succession in the Church founded by Jesus (Look for Vol 5 of the collection "God in his work of love" of the same author) on the night of the Last Supper. We cannot worship God according to our fancies. Each person must worship God according to God´s requirements to work at his or her personal salvation. (Philippians 2:12)