How do we know that salvation is certain in Christ?

The certainty of salvation in Christ is rooted in the unchanging nature of God's covenant promises. Isaiah 28:16 describes Jesus as a sure foundation, indicating that all who trust in Him are secure in their salvation. Furthermore, Romans 4:16 emphasizes that it is by faith, through grace, that the promise of salvation is secure for all who believe. As the nail in a sure place, Christ embodies the assurance that our salvation is not contingent upon our works but on His finished work on the cross. God’s purpose stands firm, meaning that all whom He has chosen will ultimately be saved, as affirmed in the doctrines of grace.