Marv Knox has published (I am sure he wrote it as well) an excellent editorial on preaching, sermon preparation, and exposition with application which can be found on the Baptist Standard website.  It is good illustrative material in reminding ourselves and those to whom we feed that our calling as pastors is to feed the sheep.  We are gifted by our calling to do this.  The flavor and nourishment of what is serve depends on our walk and our work.