How do we know the gospel is revealed by God?

In the sermon, it is emphasized that unless God reveals the gospel, individuals are left in their sin. Romans 10:17 tells us that 'faith comes by hearing, and hearing by the word of God.' This indicates that the understanding and acceptance of the gospel is a divine act. John 6:44 confirms this by stating, 'No one can come to me unless the Father who sent me draws him.' Therefore, the assurance of the gospel's truth lies in God's sovereign choice to reveal it to His people, ensuring that only those whom He foreknew will receive the message of salvation.