How do we know salvation comes through Christ alone?

The message of salvation through Christ alone is central to Reformed theology, rooted in the understanding that Jesus Christ is our substitute, who bore the full weight of divine judgment on behalf of His elect. In the book of Jonah, when Jonah tells the sailors that they must cast him into the sea for the storm to cease, it serves as a prophetic picture of Christ's sacrificial death. Just as Jonah being cast into the sea pacified the storm, Christ's sacrificial death on the cross satisfies God's wrath, bringing peace to His followers. This highlights the assurance that there is no additional work required for salvation; Christ's atonement is complete and sufficient.