An important shift happened for me not long ago.  The shift was from preaching to the congregation to instead preaching to God.  Put another way, the shift was from preaching for the purpose of exhortation to instead preaching for the purpose of exultation (worship).  When my preaching was focused on moving the congregation, I felt such a pressure to make it happen.  But since my preaching has been focused on worshiping God, there has been such a freedom.  And wouldn’t you know it:  the best exultation would seem to result in the most effective exhortation.  I am not far into this book by John Piper, but it seems to flesh out and put into words my recent experience.  It feels good to be on the right track, even if I am a slow learner.