Quotations for Trinity 18

"The New Testament is the inerrant record of the revelation of Jesus Christ in word and deed, and of the truths and principles proceeding, under the guidance of the Holy Spirit, from that revelation. The Old Testament is in like manner an inerrant record, having the express and often repeated testimony and authority of Christ, of the preparatory and partial revelations made concerning Him before His coming. Hebrews 1:1."
Henry Eyster Jacobs, A Summary of the Christian Faith, Philadelphia: General Council Publication House, 1913, p. 3. Hebrews 1:1.

"The Old Testament dealt with the promises of God to the chosen people. Thereby God placed Himself in 'covenant' relation to Israel (berith). This relation, like the promises and the gifts of God to Israel, is always onesided. It is always God's covenant, not Israel's, and not a mutual agreement, not a suntheke. This promise and covenant indeed obligates Israel, and Israel assumes these obligations, but the covenant emanates entirely from God."
R. C. H. Lenski, The Interpretation of the Epistle to the Hebrews, Columbus: Lutheran Book Concern, 1938, p. 235. Hebrews 7:22;

"In view of their spiritual meaning the psalms are really lovely and sweet; for they are comforting to all depressed, wretched consciences, who are in fear of sin, the anguish and agony of death, and all sorts of trouble and misery. To such hearts the Book of Psalms is a sweet, comforting, lovely song, because it sings and preaches the Messiah, although one merely reads or recites the words without notes. Nevertheless, the use of notes or music, as a wonderful creation and gift of God, helps greatly to produce this effect, especially when the people sing along and do so with fine devoutness...Thus David, too, often dispelled, or at least checked or weakened, the evil spirit for Saul with his minstrelsy (1 Samuel 16:17ff.). For the evil spirit is not at ease when one sings or preaches God's Word in true faith. He is a spirit of sadness and cannot stay where a heart is spiritually joyful (joyful in God and His Word).
What Luther Says, An Anthology, 3 vols., ed. Ewald M. Plass, St. Louis: Concordia Publishing House, 1959, II, p. 981. 1 Samuel 16:17ff.