In the mirror of this humanity of Jesus Christ the humanity of God enclosed in His deity reveals itself. Thus God is as He is. Thus He affirms man. Thus He is concerned about him. Thus He stands up for him. The God of Schleiermacher cannot show mercy. The God of Abraham, Isaac, and Jacob can and does. If Jesus Christ is the Word of Truth, the 'mirror of the fatherly heart of God,' then Nietzsche's statement that man is something that must be overcome is an imprudent lie.
- Karl Barth, The Humanity of God (Richmond: John Knox Press, 1960)