Pope Benedict XVI waves to faithful during his final general audience in St.Peter's Square at the Vatican, Wednesday, Feb. 27, 2013. Pope Benedict XVI has recalled moments of "joy and light" during his papacy but also times of great difficulty in an emotional, final general audience in St. Peter's Square before retiring. (AP Photo/Gregorio Borgia)

Associated Press
Pope Benedict XVI waves to faithful during his final general audience in St.Peter's Square at the Vatican, Wednesday, Feb. 27, 2013. Pope Benedict XVI has recalled moments of "joy and light" during his papacy but also times of great difficulty in an emotional, final general audience in St. Peter's Square before retiring. (AP Photo/Gregorio Borgia)
Pope Benedict XVI waves to faithful during his final general audience in St.Peter's Square at the Vatican, Wednesday, Feb. 27, 2013. Pope Benedict XVI has recalled moments of "joy and light" during his papacy but also times of great difficulty in an emotional, final general audience in St. Peter's Square before retiring. (AP Photo/Gregorio Borgia)
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