How do we know grace is central to Christian doctrine?

The grace of the Lord Jesus Christ is a fundamental aspect of the Christian faith, as described in 2 Corinthians 13:14. This grace signifies God's initiative in salvation and His willingness to forgive our sins despite our shortcomings. Paul emphasizes that we know the grace of our Lord Jesus Christ, who, though He was rich, became poor for our sakes so that we might be made rich in Him. The grace of Christ manifests in His redemptive work, exemplifying God's love and mercy, which underpins the entirety of salvation history.