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Nuns cheer during Pope Benedict XVI last Angelus Prayer in St. Peter's Square at the Vatican on February 24, 2013. FILIPPO MONTEFORTE/AFP/Getty Images

Nuns wave during Pope Benedict XVI last Angelus Prayer on St. Peter's Square at the Vatican on February 24, 2013. Pope Benedict XVI on Sunday told tens of thousands of pilgrims in St Peter's Square in a voice breaking with emotion that he was resigning because God had called on him to devote himself to prayer but said he would not abandon the Church. FILIPPO MONTEFORTE/AFP/Getty Images

Altar boys watch Pope Benedict XVI deliver his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Christopher Furlong/Getty Images)

Pope Benedict XVI delivers his blessing during his last Angelus noon prayer, from the window of his studio overlooking St. Peter's Square, at the Vatican, Sunday, Feb. 24, 2013. Benedict XVI gave his pontificate's final Sunday blessing from his studio window to the cheers of tens of thousands of people packing St. Peter's Square, but sought to reassure the faithful that he wasn't abandoning the church by retiring to spend his final years in prayer. The 85-year-old Benedict is stepping down on Thursday evening, the first pope to do so in 600 years, after saying he no longer has the mental or physical strength to vigorously lead the world's 1.2 billion Catholics. (AP Photo/Andrew Medichini)

A visitor holds a rosary chain on February 24, 2013 in Vatican City, Vatican. Pope Benedict XVI delivers his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Carsten Koall/Getty Images)

Crowds gather to see Pope Benedict XVI deliver his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Oli Scarff/Getty Images)

Nuns talk in a circle as faithful walk around after Pope Benedict XVI delivered his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Oli Scarff/Getty Images)

Nuns arrive in Peters Square on February 24, 2013 in Vatican City, Vatican. Pope Benedict XVI delivers his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Carsten Koall/Getty Images)

Blowing water from fountain on February 24, 2013 in Vatican City, Vatican. Pope Benedict XVI delivers his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Carsten Koall/Getty Images)

The Basilica in Saint Peter's Square is seen between trees on February 24, 2013 in Rome, Italy. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Oli Scarff/Getty Images)

Pope Benedict XVI delivers his blessing during his last Angelus noon prayer, from the window of his studio overlooking St. Peter's Square, at the Vatican, Sunday, Feb. 24, 2013. Benedict XVI gave his pontificate's final Sunday blessing from his studio window to the cheers of tens of thousands of people packing St. Peter's Square, but sought to reassure the faithful that he wasn't abandoning the church by retiring to spend his final years in prayer. The 85-year-old Benedict is stepping down on Thursday evening, the first pope to do so in 600 years, after saying he no longer has the mental or physical strength to vigorously lead the world's 1.2 billion Catholics. (AP Photo/Andrew Medichini)

Pope Benedict XVI delivers his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Peter Macdiarmid/Getty Images)

A nun watches Pope Benedict XVI deliver his last Angelus Blessing in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Christopher Furlong/Getty Images)

Thousands of faithful watch Pope Benedict XVI deliver his last Angelus Blessing in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Christopher Furlong/Getty Images)

A nun prays holding a flagg pictured a photograph of Pope Benedict XVI on February 24, 2013 in Vatican City, Vatican. Pope Benedict XVI delivers his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Carsten Koall/Getty Images)

Nuns wait for Pope Benedict XVI to deliver his last Angelus Blessing on February 24, 2013 in Vatican City, Vatican. Pope Benedict XVI delivers his last Angelus Blessing from the window of his private apartment to thousands of pilgrims gathered in Saint Peter's Square on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Carsten Koall/Getty Images)

A man sells flags bearing a picture of Pope Benedict XVI's ahead of the Pope's last Angelus prayers before stepping down on February 24, 2013 at St Peter's Square in Vatican city. FILIPPO MONTEFORTE/AFP/Getty Images

Rosary beads featuring Pope Benedict XVI are sold on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Oli Scarff/Getty Images)

Postcards featuring Pope Benedict XVI are sold on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Oli Scarff/Getty Images)

Members of the public walk through Saint Peter's Square at dusk on February 24, 2013 in Vatican City, Vatican. The Pontiff will hold his last weekly public audience on February 27, 2013 before he retires the following day. Pope Benedict XVI has been the leader of the Catholic Church for eight years and is the first Pope to retire since 1415. He cites ailing health as his reason for retirement and will spend the rest of his life in solitude away from public engagements. (Photo by Oli Scarff/Getty Images)