I saw this firsthand once when I listened to a series of lectures on the Pastoral Epistles from a lecturer who I could tell wished he had been given the more prestigious Romans class. Every chance he got, he was back to Romans. At the end of that series I didn’t feel like I knew the Pastorals much better than before, but maybe Romans!
There are several dangers in doing this sub-conscious leap from your passage to your preferred passage:
1. You will lack variety and richness in your ministry. That is, every passage will sound like the handful of your favourites that always trump the text before you. This does not make for a healthy and balanced diet for your church.
2. You will teach listeners that the Bible is very limited. They will start to copy you and soon be reading one thing and seeing their pet passages instead. Your people need the whole Bible for spiritual health.
3. You will lose integrity as a biblical interpreter. Your listeners will sub-consciously, if not consciously, start to recognize an inability to let the preaching passage mark your life and ministry. People typically have less respect for a pet passage preacher, or if not, they should.
4. You will miss out on the richness of the Bible. You will flatten it out into a 2-dimensional line drawing when actually there is a depth and richness throughout the canon. Even though you’re tempted to go elsewhere, study and preach the passage in front of you – it will be profitable!