19. Therefore in saying, “That they may know Thee, the only true God, and Jesus Christ Whom Thou hast sent,” he put an end to the Sabellians, and has also put the Jews out of court,—those at any rate who heard him speak; so that the former might not suppose the Same to be the Father as the Son, which they might have done if he had not added also Christ, and that the latter might not sever the Son from the Father.