They went out from us, but they didn't belong to us; for if they had belonged to us, they would have continued with us. But they left, that they might be revealed that none of them belong to us.
So in the beginning of their faith they were taught that Jesus Christ was the Son of God. He came to be the Savior of the world. Now hold fast to that, let it abide in you, for you will continue both in the Son and in the Father.