"We are workers with you for your joy," states St. Paul, "because you stand firm in the faith." These words, declared Pope Benedict XVI in a 2008 ordination homily, are the very program of the priesthood. To fulfill this program, he told the ordinandi, "the fire of the Gospel must burn within you and the joy of the Lord dwell in you. Only then will you be able to be messengers and multipliers of this joy." Remarkably, the...