How do we know that the message of the gospel is true?

The truth of the gospel is based on divine revelation. As mentioned, the only way we know anything with certainty, including the gospel, is through God's declaration in scripture. Hebrews 11:3 affirms that our understanding of the world and our faith is evidenced by what God has said. Therefore, our belief is built upon the assurance that God, through various prophets and apostles, has told us the truth of our condition and His redemptive plan in Christ. This assurance is bolstered by the Holy Spirit's work, who illuminates our minds to accept these truths with faith.