Bonhoeffer's Psalms the Prayerbook of the Bible is full of great insights like this:
Jesus Christ has brought every need, every joy, every gratitude, every hope of men before God. In his mouth the word of man becomes the Word of God, and if we pray his prayer with him, the Word of God becomes once again the word of man. All prayers of the Bible are such prayers which we pray together with Jesus Christ, in which he accompanies us, and through which he brings us into the presence of God. Othewise there are no true prayers, for only in and with Jesus Christ can we truly pray.
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