How do we know salvation is only through Christ?

The assurance of salvation through Christ alone is anchored in Scripture. Colossians 2:9-10 reveals that in Christ dwells all the fullness of God, and that believers are complete in Him. The apostle Paul emphasizes that there are no works to be added to Christ's finished work; salvation stems solely from His redemptive act on the cross. This doctrine reinforces the Reformed understanding that salvation is by grace alone, through faith alone, in Christ alone. Therefore, for those who believe, there is profound certainty that no additional works or rituals are necessary to secure salvation, further brightening the believer's hope in Christ's sufficient grace.