“He doesn’t run away from the wolves,” he said.

So who are the wolves? Mr. Vian was at first surprisingly literal. “The wolves?” he asked. “The most obvious are those who persecute Christians.” There are other wolves, in Christian countries, who are intolerant of believers, he added.

But, he continued, “'there are also wolves within the church, and inside all humans.”

Mr. Vian, ever the scholar, swiveled back and forth between his bookshelf and his computer, pulling out references, from the Roman poet Ovid, and St. Paul’s Letter to the Romans, to the perpetual struggle between good and evil.

Then he dug out, from a pile of newspapers, a lengthy discourse by Benedict himself, made without notes on Feb. 8, in which he spoke of “serious, dangerous omissions,” “errors” and a church that in some places “is dying because of the sins of men and women.”

Mr. Vian, who has run articles on the church's sex abuse scandals, believes that the VatiLeaks scandal, involving the theft of papal documents, was itself a sign that Benedict had succeeded in bringing about greater transparency, prompting a counterreaction. “The papacy of Benedict XVI has been very effective,” he said.

Five years ago, when he was named editor of L’Osservatore, Mr. Vian was hailed as an intellectual journalist, well suited to serve an intellectual pope, who was now his publisher. But his interests range beyond ecclesiastical subjects to include Tintin, the comic-book boy-hero whose posters hang in his office.

Mr. Vian was no stranger to the Vatican. The son of the secretary of the Vatican library, from a family that had ties to previous popes, he grew up within its walls, and played with his brothers in its gardens.

To his father’s dismay, Mr. Vian dabbled in journalism, writing for the Italian Catholic newspaper Avvenire and L’Osservatore, even as he pursued his doctorate and worked on the Italian encyclopedia.