The Psalter occupies a unique place in all the Holy Scriptures. It is God’s Word, and with few exceptions it is at the same time the prayer of human beings. How are we to understand this? How can God’s Word be at the same time prayer to God? This question is followed by an observation made by all who begin to pray the Psalms. First, they try to repeat the Psalms personally as their own prayer. But soon they come across passages that they feel they cannot pray as their own personal prayers. We remember, for example, the psalms of innocence, the psalms of vengeance, and also, in part, the psalms of suffering. Nevertheless, these prayers are words of the Holy Scriptures that believing Christians cannot simply dismiss as obsolete and antiquated. Thus they do not desire to gain control over the word of Scripture, and yet they realize that they cannot pray these words. They can read them as the prayer of another person, wonder about them, be offended by them, but they can neither pray them themselves nor expunge them from the Holy Scriptures…. [T]his difficulty actually indicates the point at which we may get our first glimpse of the secret of the Psalter. The psalms that will not cross our lips as prayers, those that make us falter and offend us, make us suspect that here someone else is praying, not we – that the one who is here affirming his innocence, who is calling God’s judgment, who has come to such infinite depths of suffering, is none other than Jesus Christ himself. It is he who is praying here, and not only here, but in the whole Psalter. The New Testament and the church have always recognized and testified to his truth. The human Jesus Christ to whom no affliction, no illness, no suffering is unknown, and who yet was the wholly innocent and righteous one, is praying in the Psalter through the mouth of his congregation. The Psalter is the prayer book of Jesus in the truest sense of the word. He prayed the Psalter, and now it has become his prayer for all time. Can we now comprehend how the Psalter is capable of being simultaneously prayer to God and yet God’s own Word, precisely because the praying Christ encounters us here?
Dietrich Bonhoeffer (1906-45), Life Together, 53-55.