How do we know the gospel is about Jesus according to the sermon?

The sermon emphasizes that the gospel has always been about Jesus Christ. In Galatians 3:8, Paul states that the promise made to Abraham signifies the gospel's reach to all nations. This is evident in the covenant God made with Abraham, which not only contained blessings for Abraham's descendants but ultimately pointed to Christ, who unites all believers from every nation. The blessings promised to Abraham in this covenant exemplify Christ as the source of spiritual blessings for the elect, confirming the central role of Jesus in God's redemptive plan.