Nothing he wrote is more famous than Chapter 13 of the First Letter to the Corinthians. You've heard it at probably 70% of the weddings you've attended: "Love is patient, love is kind..." The Catholic Church reads this on the 4th Sunday of the Year (C). And I decided to preach on it.
(If you'd like to download it rather than stream it, click here, and right-click on the "2.9 MB" under "Apple Lossless Audio" in the bottom right corner.)
This is a pretty basic overview. It's not in-depth on any point. It touches briefly on thoughts from St. Thérèse, Martin Luther (sort of), and J.R.R. Tolkien. It makes fun of Valentine's Day, Milli Vanilli, and myself. And yes, I do a dubious imitation of Alan Jackson singing in it.
My apologies in advance.