One of the best ways to overcome "sermon block" is to think through What’s hard to believe about this passage? We can underrate the need to prove the truth of a text. Even if there isn’t a skeptical bone in our body, we need task, Will those who hear me believe this? Does this conform to my and their experience? If not, why not?
Our experience doesn’t govern the Bible, but we need to explain perceived discrepancies between what the Bible says and our reality.