It will never be possible to preach with power and impact lives without the Holy Spirit, for this is like cutting a tree with the handle of the ax only, without the cutting blade. Studying is good, knowing the Bible and empowering yourself is fundamental, but there is no substitute for a personal relationship with God.
In this Complete Course, I've shared incredible strategies for designing and delivering highly impactful sermons, and many of those who have already accessed this material, after applying, have had a radical transformation in their preaching.