The sermon centers on the comforting truth of God's eternal decree, assuring believers of their unshakable security in Christ. It emphasizes that God's sovereign choice of believers from eternity past—rooted in His loving purpose, not human merit—guarantees their salvation, sanctification, and ultimate glorification. This divine assurance, grounded in the order of salvation and the unchanging love of God, provides stability amid persecution and false teaching, especially the deception that Christ has already returned. The preacher calls believers to stand firm and hold fast to the apostolic teachings, trusting in the Holy Spirit's guidance and the enduring truth of Scripture. Ultimately, the passage culminates in a prayer for divine comfort and establishment, as God, through grace, strengthens His people to persevere in every good work and word, confident in His eternal faithfulness.