VATICAN CITY – On Monday, April 4, 2005, a priest walked up to the Renaissance palazzo housing the Vatican’s doctrine department and asked the doorman to call the official in charge: It was the first day of business after Pope John Paul II had died, and the cleric wanted to get back to work.

The office’s No. 2, Archbishop Angelo Amato, answered the phone and was stunned: This was no ordinary priest. It was Cardinal Joseph Ratzinger, his boss, who under the Vatican’s arcane rules had technically lost his job when John Paul died.

“It tells me of the great humility of the man, the great sense of duty, but also the great awareness that we are here to do a job,” said Bishop Charles Scicluna, who worked with Ratzinger before he became Pope Benedict XVI, inside the Congregation for the Doctrine of the Faith.