Start at the Cross and Make a Beeline to Practicality?

I don't think it's a good idea to end every sermon on the cross. I think it creates forces of artificial. My understanding of how the whole Bible is Christ-centered or the entire Bible is gospel dense, is based on Romans 832. He who did not spare his own son but gave him up for us all. That's what the verse says. The cross bought every blessing and every promise in the Old Testament.