Those who are justified by grace, by faith in Christ, are the only ones who really know that they are lost sinners, apart from Christ, but those who have not received Christ’s forgiveness and the verdict it entails upon their humanity are the ones who regard themselves as able to justify themselves. Similarly, those who have come to know the mystery of Christ as true God and true man are the only ones who really know that they themselves are in ignorance, and that by themselves, by their own capacities, they cannot know the mystery. But those who have not received Jesus Christ, who have avoided the mystery. But those who have not received Jesus Christ, who have avoided the mystery and therefore have not come to know it, are those who think they can understand how God and man can come together. Both the sinner who is forgiven by Christ and the man or woman who has come to see the face of God in the face of Christ, know that they can never master or dominate the mystery of Christ in their hearts, but can only acknowledge it gladly with wonder and thankfulness, and seek to understand the mystery out of itself, that is, seek to let it declare itself to them, seek to let themselves be told by the mystery what it is. They will acknowledge that this is a mystery that is not conceivable in ordinary human thought — it is a miracle. And if they know something of this miracle they will know that even their knowing of it is a very wonderful thing, that it is an act of God. They know the mystery by faith, in the power of the Spirit, but not by themselves alone. It is a gift of God. That belongs to the very content of the doctrine of the virgin birth and its significance for our knowing of Christ.
 Thomas F. Torrance, Incarnation: The Person and Life of Christ, 87-88.