Peter Mead provides a helpful reminder here of the tendency to say to much in preaching. He writes,
Most of us, in our first sermon, tried to say too much. We tried to cram in all we knew on that subject. We tried to miss nothing, preached dense and probably missed everyone listening. Keep that in mind today. Don’t try and say so much that you end up effectively saying nothing. Don’t feel the need to prove how many hours of exegetical work you put in, or what exegetical bunny trails you pursued to no avail. Say one thing, and say it well. Say it clear. Say it more than once. But don’t say too much!