How do we know that preaching the gospel is necessary?

The necessity of preaching the gospel stems from God's sovereign plan for salvation. Romans 10:14 asserts that 'how shall they believe in Him of whom they have not heard?' This implies that the proclamation of the gospel is indispensable. Preaching is not merely an option for believers but a divine commission that peers into the heart of God's redemptive purpose. God has chosen this means to both glorify Himself and to call sinners into fellowship with Him. When ministers of the gospel faithfully proclaim the truth, they serve as instruments of the Holy Spirit, working towards the salvation of the elect.