Here’s how Oak Hill College describes them:
Jonathan Edwards believed that the ultimate purpose of preaching is not only to make the truth clear, but also to make it real—affecting and life-changing. This is usually covered under the topic of “application”, though framing the subject in that way often results in a “tack-on” of practical advice after a dry, academic exposition.
How can we preach the text from first to last in a way that exalts Christ, changes heart motivations, produces wisdom and wonder, persuades the sceptical and results in real life change? In his two lectures, Tim Keller explores these challenges to the preacher.