The Vatican, as one aphorism puts it, tends to “think in centuries.” But Pope Leo XIV seems intent on changing that, moving with remarkable speed to publish his first encyclical today, Magnifica Humanitas , “on safeguarding the human person in the time of artificial intelligence.” Leo has managed to produce a major teaching document on AI while college students are still booing commencement speeches about how the technology will change the world. Compare that with his 19th-century namesake,