I teach a course on “The Trinity and Christian Salvation” to masters students at Notre Dame. My students include lay ministers, seminarians, deacons, teachers, and inquiring adult and young adult Catholics of all kinds. After we have progressed through our studies a bit, I bring up the issue of preaching on “Trinity Sunday”. The immediately get it––they have all experienced mostly bad homilies on this day above all days. I give them a chance then to come up with a “Naughty List” (things to avoid on Trinity Sunday) and a “Nice List” (what to include or focus on when preaching on Trinity Sunday). Here are some of the most common responses…