Between Second Thessalonians and First Timothy we read two Psalms and the last chapter of Isaiah.
Psalm 101, of David. A song of praise and a vow that reads like a new year’s resolution.
Psalm 102. A penitential psalm. It recalls the great deeds and miracles God did for His people in the wilderness, and how they disobeyed and turned to idols, even to the point of child sacrifice. In spite of this God is still merciful and there is still hope. It ends with Hallelujah!
Isaiah 66 speaks of judgement and hope, and true and false worship. Yet, the LORD will vindicate Zion; “Behold, I will extend peace to her like a river, and the glory of the Gentiles like a flowing stream“. Finally, God wraps up the book of Isaiah with the Day of the LORD and its sobering aftermath.