I'm sure we've all experienced sermons that we loved, and those that have put us to sleep [so often the subject treated is just of little interest to the congregation]. What we should be most aware of during these sermons is the grand opportunity of the speaker interfacing with the congregation, and how this may be the listener's only practical opportunity to learn from the speaker.
Accordingly, at each occasion of instruction/story-telling by a religious [or any] speaker, and whether to the laity/members/audience or to other clergymen, there should be one point at which at least one of those giving instruction [sermon, pastoral letter, etc.] promotes communal inter-communication by allowing those in attendance to ask questions on anything mentioned, or even on some unrelated matter that does concern religious or ethical understanding [what a great inducement for people to not miss a service and so learn of something intimately relevant to their own circumstances, or possibly completely unexpected or even shocking]; however, it is perfectly proper to postpone answer until some stated future occasion, so as to allow for better reflection on what is the best answer -- or even eventual statement that honestly do not know the answer, or can only give an approximation of the answer.