How do we know the gospel is the true Word of God?

The authenticity of the gospel as the Word of God is affirmed in its divine origin and the power it wields in believers' lives. In 1 Thessalonians 2:13, Paul highlights that the Thessalonians did not merely accept the message as human words but recognized it as the truth from God. This is crucial because it speaks to the inspiration of Scripture; every word is inspired by God, and its teachings carry divine authority. The effectiveness of the gospel in bringing about spiritual transformation and repentance also serves as proof of its truth. The changes seen in believers' lives attest to its power to save and sanctify, further confirming its authenticity.