Before the world was even made the Father wanted to bind himself to us in the deepest union and communion. And even though we resisted God’s purpose he resisted our resistance. For at God’s appointed time the Father’s Son stepped among us as human deliberately entering into living solidarity with his fellow humans. At last in the midst of our fallen humanity, in spite of our estrangement from God, he comes in his love binding himself to us for ever. In this total solidarity with us he even Jesus went down the lowest place to lift us up to the highest place at home with his Father.
So in Jesus, the Father’s Son, God has pledged his very Being to us and us to himself. Can God go back on this? If he did so he would deny himself. As T. F. Torrance says, “He cannot go back upon it without undoing the Incarnation and the Cross and thereby denying himself”. For Christ is God himself as human giving himself totally to us and for us that we might belong with him to his Father in the communion of the Spirit. God and humans are now bound together in Jesus as new covenant that is better by far than the one before.