How do we know the gospel has the power to save?

In Romans 1:16, Paul boldly states, 'I am not ashamed of the gospel of Christ, for it is the power of God unto salvation to everyone that believes.' This assertion underscores the divine authority and effectiveness of the gospel message in calling sinners to salvation. It is through the gospel that God reveals His mercy, grace, and righteousness—effectively bringing the dead to life. The preaching of the gospel is the means appointed by God to impart faith, quickening those who hear and believe.