I've started a new habit. Every week I spend most of my time on sermon prep on Friday and Saturday. On Saturday evening, when my preparations are done, I'm reading for an hour on the Gospel, the Cross, or the life and work of Jesus. I find as I finish my preparation it really helps me to focus on the point of every biblical passage, the Gospel.
I'm starting by rereading John Stott's The Cross of Christ, which I read in seminary and loved.