By denying the doctrine of the final perseverance of the saints, there will be inevitable negative implications for everything else that is true about Christian salvation. Perhaps even more problematic, says Dr. Martyn Lloyd-Jones in his sermon on Romans 8:28–30 titled “The Unbreakable Chain,” is the confusion and chaos that is introduced about God by those affirming the apostasy of genuine believers. He examines the harmony of each link in the apostle Paul’s unbreakable chain, noting how each inevitably hangs together. By considering the negative implications for the doctrine of predestination and foreknowledge, Dr. Lloyd-Jones demonstrates the absurd conclusions that must be affirmed about God when one holds to the possibility of a true believer falling from grace. Continuing through the chain of redemption, he argues that those who affirm the apostasy position make God’s “call” pointless and the doctrine of justification an error-filled action on God’s part. However, the doctrine of rebirth and union with Christ should settle the matter altogether, says Dr. Lloyd-Jones. It is scandalous to suggest that God’s creative work in giving new life and His seating of His people in the heavenly places with Christ can be suddenly undone. Listen to Dr. Lloyd-Jones’s argument for an unbreakable chain in salvation and find encouragement in the blessed doctrine of assurance from beginning to end.

http://www.mljtrust.org/sermons/the-unbreakable-chain/