How do we know that salvation is forever?

The doctrine of perseverance of the saints teaches that true believers are kept by the power of God through faith unto salvation (1 Peter 1:5). In John 17:11-12, Jesus indicates that He has kept all those the Father gave Him, except the son of perdition, Judas Iscariot, emphasizing that all true believers are secure in Christ's hands. Additionally, Romans 8:38-39 assures us that nothing can separate us from the love of God in Christ Jesus, reinforcing the truth that salvation is eternal for the elect.