How do we know that true believers cannot fall away permanently?

The assurance that true believers cannot fall away permanently stems from the doctrine of the perseverance of the saints, which holds that those truly regenerated by the Holy Spirit will persevere in faith until the end. Philippians 1:6 affirms this by stating, 'He who began a good work in you will carry it on to completion until the day of Christ Jesus.' While believers may experience struggles and doubts, the evidence of their faith lies in their continued trust in Christ, not in their ability to stand alone. This underscores the importance of recognizing that our standing is dependent on God's faithfulness, not our own strength or spiritual accomplishments.