How do we know that the preaching of the gospel is necessary?

According to 1 Corinthians and the sermon, God has appointed preaching as the primary means to communicate the gospel. This is outlined in verses 19-21, which argue that preaching is essential because it pleases God and effectively demonstrates His power to save. The necessity of preaching lies in its role as the instrument that exposes the futility of human wisdom and reveals the true wisdom found in Christ. The clear message of salvation by grace alone through faith alone is what God has ordained to call His people to Himself.