We believe even as God reveals and do testify of Himself. That there's ONE God, besides Him there is NO other. God is a Spirit and they that worship Him must worship Him in spirit and in truth. God's word is spirit and truth. The Father, Son and Holy Spirit is one being. The Father made a body (Jesus), walked among us, died for us. He rose on the third day, ascended to heaven and fills every believer with the Holy Spirit (Himself). This is the seal of his promise (the seal of God) it's his claim on us. With his seal we are assured of our salvation. It's his seal of approval that gets you into the gate of God's Kingdom.