How do we know that grace is sufficient for sinners?

The sufficiency of grace for sinners is rooted in the finished work of Christ, as stated in Isaiah 40:2, which declares that 'her warfare is accomplished, that her iniquity is pardoned.' The sermon emphasizes that Christ has fulfilled the requirements of the law on our behalf, and His sacrificial death has effectively atoned for all our sins. This assurance that our iniquities are pardoned gives believers peace, for we are no longer in bondage to sin. The perfect and sufficient sacrifice of Jesus assures us that our standing before God is based not on our works but on His grace. Moreover, we are reminded through scripture that God is faithful, and His promises are sure, providing a firm foundation for our hope and assurance.