How do we know that Jesus is sufficient for salvation?

The sufficiency of Christ is central to the gospel message. As Paul argues in Galatians, adding anything to the work of Christ, such as legalism or good works, undermines the very essence of the gospel. For believers, being saved by grace means that Christ's sacrifice on the cross fully satisfies the requirements of the law. The grace of God in Christ is not only sufficient for our justification but also essential for our sanctification. Paul emphasizes in Galatians that if righteousness could be gained through the law, then Christ died for nothing (Galatians 2:21), reinforcing that salvation rests solely on the person and work of Jesus.