Q.94: How is the Word made effectual to salvation?
A. The Spirit of God makes the reading, but especially the preaching of the Word, an effectual means of convincing and converting sinners, and of building them up in holiness and comfort through faith unto salvation.
So, as much as is in me, I am ready to preach the gospel to you who are in Rome also. For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes, for the Jew first and also for the Greek. Romans 1:15-16