How does boasting in ourselves conflict with grace?

Boasting in ourselves reflects a fundamental misunderstanding of grace and our role in salvation. Ephesians 2:9 states that salvation is not by works, so that no one can boast. When we boast, we essentially claim credit for something that is solely God's doing: our redemption. Grace, defined as unmerited favor, reveals that we bring no righteousness to the table. All we contribute is our need for salvation. Realizing this should lead us away from self-sufficiency and toward reliance on Christ, who is the source of our hope and assurance.