The supreme mystery with which the gospel confronts us, [lies] in the Christmas message of Incarnation. The really staggering Christian claim is that Jesus of Nazareth was God made man. . . determining human destiny, . . . and that He took humanity without loss of deity, so that Jesus of Nazareth was as truly and fully divine as He was human. . . . . It is here, in the thing that happened at the first Christmas, that the profoundest and most unfathomable depths of the Christian revelation lie. ‘The Word became flesh’ (John 1:14); God became man; the divine Son became a Jew; the Almighty appeared on earth as a helpless human baby, unable to do more than lie and stare and wriggle and make noises, needing to be fed and changed and taught to talk like any other child. . . . . The more you think about it, the more staggering it gets. Nothing in fiction is so fantastic as is this truth of the Incarnation.
—J.I. Packer, Knowing God (Downers Grove, IL: IVP, 1973), 53.