“The main benefit that is obtained by preaching is by impression made upon the mind in the time of it, and not by an effect that arises afterwards by a remembrance of what was delivered.”–Jonathan Edwards
One of the challenges to preaching is placing an inordinate amount of pressure upon the content that is delivered. Preachers aspire to make truth memorable, if not quotable. After spending hours pouring over manuscripts in preparation and ultimately delivery of the sermon, preachers wonder why their words are forgotten by the time their congregations unfold their napkins for Sunday lunch.
I think this is because we have misguided impressions as to the impact of one sermon. In reality, it is the cumulative volume of a body of work that has the lasting impact on the lives of church members.