This has been a pet peeve of mine for some time. I can't count the number of pastors I've heard on the radio and in person who've timidly prefaced doctrinal expositions with an apology to the congregation as though the explanation of biblical theology is, at best, bitter medicine and, at worst, a necessary evil. Preachers don't regularly apologize for telling jokes and stories. Why, then, do we frequently feel compelled to beg our hearers' pardon for fulfilling the God-given mandate to "give instruction in sound doctrine" (Titus 1:9)?
Peter closes with this much-needed counsel to his peers:
Don’t give the impression that some sermons are biblical, exegetical, theological, doctrinal, while others are practical, pastoral, relevant and helpful. Strive to demonstrate that both sides are really on the same side - there really is no contest.