We cannot help but draw dividing lines, but the Gospel wants us to know that they are our lines, not God’s. They are a consequence of sin’s entrance in the world.
The homily should be part of an active relationship between preacher and parish. None of us, speaking or listening, should stop trying to improve the experience.
This is the theological virtue we call hope: remaining open to what will come, to whatever God determines. And what that might be, we truly do not know, no matter how certain we might think that we are.