Ephesians 1. This letter has a wonderful explanation of the Christian Gospel. The Apostle Paul stars out with a greeting, then explains what it means to get redemption in Christ and ends up with a prayer for spiritual wisdom.
Isaiah 44. Israel is the chosen nation, God is supreme, idols are worthless. Sing, for the LORD has done it. God is the one “That saith of Cyrus, He is my shepherd, and shall perform all my pleasure: even saying to Jerusalem, Thou shalt be built; and to the temple, Thy foundation shall be laid.”
Isaiah 45. Cyrus was God’s instrument. God gave him “the treasures of darkness”, though he did not acknowledge Him. The Lord is the only savior, there is none else. God said: “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.”