How do we know Jesus saves us entirely?

The assurance of complete salvation comes from the doctrine of imputation, which means that Jesus' righteousness is credited to believers. The Apostle Paul explains in 2 Corinthians 5:21 that 'He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him.' This doctrine reveals that our standing before God is not based on our own merits but on the perfect obedience and sacrifice of Christ. Furthermore, God's sovereign grace ensures that those He calls and justifies will be glorified (Romans 8:30), affirming that Christ is indeed all our salvation.