Eifion Evans emphasizes the historical connection between preaching and revival, highlighting the importance of experiential, passionate, direct, and doctrinal preaching in past revivals. He discusses how God's presence and power in a preacher's life precede effective preaching, as seen in the experiences of Howell Harris and George Whitefield. Evans also delves into the necessity of plain and direct speech in preaching, focusing on the basic doctrines of Scripture like regeneration. He concludes by stressing the need for a revival of preaching today, coupled with a fresh outpouring of the Holy Spirit for boldness and effectiveness.