In Oneness theology, the Godhead is not three persons united by one substance, but one God who reveals himself in three different modes. Thus, God relates himself to humanity as our Father within creation, he manifests himself in human form as the Son by virtue of his incarnation as Jesus Christ (), and he is the Holy Spirit () by way of his activity in the life of the believer. Oneness Pentecostals believe that Jesus is the name of God and therefore baptize in the name of Jesus Christ as performed by the apostles (), fulfilling the instructions left by Jesus Christ in the Great Commission (), they believe that Jesus is the only name given to mankind by which we must be saved ().