How do we know that salvation is a gift of grace?

Salvation being a gift of grace is deeply rooted in the biblical concept of God's sovereignty and grace. The angel's proclamation of 'good tidings of great joy' indicates that God offers salvation freely, without requiring any precondition from us. Paul affirms this in 1 Corinthians 1:26-29, noting that God chooses the weak and foolish things of the world, ensuring that 'no flesh should glory in his presence.' The truth that salvation is not conditional emphasizes that it is a sovereign act of God, carried out through Christ's atoning work, making grace truly unmerited and available to all who believe.