How do we know that true believers will persevere?

The doctrine of the perseverance of the saints is deeply rooted in Scripture, particularly in John 10:28, where Jesus assures His followers, saying, 'I give them eternal life, and they shall never perish; no one will snatch them out of my hand.' This promise reflects the sovereign grace of God, ensuring that those He has truly saved will continue in faith until the end. Genuine believers may face trials, deception, and temptations, but they will ultimately be preserved by God's power. A key aspect of this perseverance is that those who fall away demonstrate that they were never genuinely converted, as Paul emphasizes in his letters that true faith is not merely intellectual but a saving faith that endures through challenges.