The sermon emphasizes the miraculous nature of preaching as a divine act where God sends His perfect message through an imperfect messenger to an imperfect people. Drawing primarily from Haggai 1:13, it outlines the dynamics of the preached word, highlighting that both the preacher's calling and the delivery of the message are miracles of grace that overcome spiritual opposition. The speaker warns against treating preaching lightly, urging preachers to recognize their sacred commission and hearers to approach the Word with reverence and readiness. It asserts that true preaching is not human wisdom but God's power, essential for saving souls and strengthening believers. Ultimately, the text calls for a deep appreciation of this privilege, recognizing that every sermon involves spiritual battles won by God for the benefit of His people.