How do we know preaching is essential for Christians?

Preaching is crucial for Christians because it is through preaching that the gospel is communicated, providing believers with the truths necessary for faith and nourishment. As noted in Romans 10:17, 'So then faith comes by hearing, and hearing by the word of God,' which shows that faith is ignited and strengthened through the preached word. The act of preaching is a divine appointment with God using men to convey His truths, creating faith and enabling believers to grow in their understanding of the kingdom of God.