How do we know that salvation is applied through the gospel?

In Romans 10, Paul explains the process of salvation by highlighting that faith comes from hearing the message of Christ. Without hearing the gospel, one cannot believe or call upon the Lord for salvation. The Holy Spirit is actively involved in this process, applying the work of Christ in our lives as He produces faith and repentance in our hearts. The power of God is revealed through the gospel which leads to our salvation, making it clear that salvation is not just a one-time event, but an ongoing work in the life of the believer as we grow and mature in faith and in our understanding of God's grace.