After a year of barbed commentary directed at liturgical traditionalists from many quarters, the Holy Father’s apostolic letter Desiderio Desideravi, dated June 29 for the solemn Solemnity of Sts. Peter and Paul, takes a rather different tack, both in tone and substance. Desiderio Desideravi takes its title from the words of Jesus at the beginning of the Last Supper: “I have earnestly desired to eat this Passover with you before I suffer” (Luke 22:15)…