How do we know that preaching the gospel is necessary?

Preaching is central to the Christian faith because it is God's chosen means to communicate the gospel. In 1 Corinthians 1:21, Paul writes that it pleased God to save those who believe through the foolishness of preaching. This highlights that preaching is not merely an academic exercise; it is the means by which God calls His elect and feeds the faith of believers. The model of God sending preachers, as illustrated in the story of the Ethiopian eunuch and Philip, reinforces the need for preaching to explain God's truth and lead others to believe. Thus, preaching is essential not only for evangelism but also for the edification of the church.