Pope Benedict XVI might resign if his health failed

In a book of interviews, the 83-year Pontiff challenged centuries of Catholic Church tradition by saying that he would not hesitate to relinquish his post if no longer felt "physically, psychologically and spiritually" up to the job.

The papacy has traditionally been seen as a job for life, with pontiffs expected to remain at the helm of the Church until death. The last pontiff to resign willingly was Celestine V in 1294.

But in the book, "Light of the World: The Pope, the Church, and the Sign of the Times", Benedict said: "Yes, if a Pope clearly realises that he is no longer physically, psychologically and spiritually capable of handling the duties of his office, then he has a right and, under some circumstances, also an obligation, to resign."

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