Why should Christians reject self-righteousness?

Self-righteousness is a detour away from the true grace of God that leads to salvation. It is fueled by pride, which exalts personal achievements over reliance on Christ's finished work. As Ephesians 2:8-9 says, 'For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast.' When individuals cling to their own righteousness or believe they can contribute to their salvation, they diminish the sufficiency of Christ's sacrifice. It is vital for Christians to reject any notion that implies they can earn their way to God, as this undermines the grace that is freely offered to all who believe.