How do we know Christ alone is sufficient for salvation?

The sufficiency of Christ for salvation is a pivotal doctrine in Reformed theology, prominently highlighted in the book of Galatians. When Paul confronts the Judaizers, he firmly states that if righteousness could be gained through the law, then Christ died for nothing (Galatians 2:21). The message of the gospel proclaims that it is through faith in Christ alone, His person, and work, that believers are justified. Any attempt to add human merit or obedience undermines the full efficacy of His redemptive work. Therefore, it is essential to grasp that Christ and His atoning sacrifice are wholly sufficient for our salvation.