Article Photos: Now a 'simple pilgrim,' Benedict resigns papacy 23/23

In this image taken from video, Pope Benedict XVI delivers his final message to the assembly of cardinals at the Vatican Thursday Feb. 28, 2013, before he retires in just a few hours. Benedict urged the cardinals to work in unity and promised his "unconditional reverence and obedience" to his successor in a poignant and powerful farewell before he becomes the first pope in 600 years to resign. (AP Photo/Vatican TV)