In Jesus Christ there is no isolation of man from God or of God from man. Rather, in Him we encounter the history, the dialogue, in which God and man meet together and are together, the reality of the covenant mutually contracted, preserved, and fulfilled by them. Jesus Christ is in His one Person, as true God, man’s loyal partner, and as true man, God’s. He is the Lord humbled for communion with man and likewise the Servant exalted to communion with God. He is the Word spoken from the loftiest, most luminous transcendence and likewise the Word heard in the deepest, darkest immanence. He is both, without their being confused but also without their being divided; He is wholly the one and wholly the other. Thus in this oneness Jesus Christ is the Mediator, the Reconciler, between God and man.
Karl Barth, The Humanity of God