How do we know the doctrine of perseverance of the saints is true?

The doctrine of perseverance of the saints, often illustrated through the experiences of biblical figures, is rooted in the belief that true believers will ultimately be kept by God's power. In 2 Timothy 4:10, Paul mentions Demas's departure, which serves as a warning about the dangers of loving the world over Christ. It highlights the distinction between those who truly belong to Christ and those who do not. Paul also expresses confidence in the ability of God to keep His people, stating in verse 18 that the Lord shall deliver him. This assurance is echoed throughout Scripture, affirming that although believers may stumble, God will preserve them and bring them to his heavenly kingdom, supporting the belief that those truly redeemed will not lose their salvation.