In between Colossians and 1 Thessalonians we read two Psalms and one chapter of Isaiah.
Psalm 90, a Prayer of Moses, the Man of God. This is his prayer in the wilderness, and is the only song of Moses in the Psalms, but there are two others in the Pentateuch (Exodus 15 and Deuteronomy 32-33).
Psalm 91. It shall remain anonymous. Charles Spurgeon commented: “In the whole collection there is not a more cheering Psalm, its tone is elevated and sustained throughout, faith is at its best, and speaks nobly.” He also quoted (in English) Siméon Marotte deMuis: “It is one of the most excellent works of this kind which has ever appeared. It is impossible to imagine anything more solid, more beautiful, more profound, or more ornamented.”
Isaiah 45. Cyrus is God’s instrument. God will give him “the treasures of darkness”, though he does not acknowledge Him. The Lord is the only savior, there is none else. God says: “I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.”