The former head of the Catholic Church says he has no regrets and believes history will vindicate him.
The Vatican said Pope Francis had approved a second miracle attributed to John Paul II.
Roman Catholic cardinals will start their conclave to elect a successor to Pope Benedict on March 12.
The Vatican told cardinals gathered for the election of the next pope to stop speaking to the media.
Pope Benedict says his last goodbyes and moves on.
Pope Benedict bid an emotional farewell at his last general audience on Wednesday.