How do we know once saved always saved is true?

The doctrine of 'once saved, always saved' is affirmed by biblical texts that emphasize God's sovereign grace in the preservation of believers. Romans 8:33 states, 'Who shall lay anything to the charge of God's elect? It is God that justifies.' This indicates that the security of the believer is based on God's justification, not on human performance. Furthermore, John 10:28 assures us that no one can snatch the elect out of Christ's hand, emphasizing divine protection and preservation. Hence, true believers, empowered by the Holy Spirit, will inevitably continue in their faith and cannot be ultimately lost.