Wisdom from Bonhoeffer

Speaking of the importance of familiarity with the Old Testament, not only the New:

It is only when one knows that the names of God cannot be expressed, that one can express the name Jesus Christ; it is only when one so loves life and this world that the thought of losing them appears to be the end, that one can believe in the resurrection of the dead and a new world; it is only when one submits to the law of God, that one may really speak of grace; and only when one is convinced that the anger and vengeance of God against his enemy is justified, that forgiveness and love of our enemy can begin to move our hearts.