Doug Wilson can turn a phrase better than most. His preaching style is probably not your style and his theology is probably not your theology in all points but here he provides a few thoughts on the role of the Holy Spirit and sermon preparation. Even if you don’t tuck in your shirt when you preach you can probably learn something here.
Money quote: “Prepare the man before you prepare the message. The first issue relates to character — confess sin, grow in grace, resist temptation, feed your soul something other than spiritual Doritos.”
The gist: The Spirit is with you as a minister of Christ. There is no reason that the Holy Spirit cannot bless you in the study as well as in the pulpit, if you are rightly seeking that blessing. You are His servant in both the preparation and the delivery. Why would He be with you in one place and not in the other?