By Catholic News Agency - Cardinal Robert Sarah said Monday that claims Pope Emeritus Benedict XVI did not co-author with him a new book on priestly celibacy are “defamations of exceptional gravity.”… The publisher of the book told CNA that critics suggesting that the pope emeritus did not co-author the book, or authorize its publication, are wrong…. “Are these people really implying that Cardinal Sarah is involved in a conspiracy to distort the truth?” Jesuit Father Joseph Fessio, editor-in-chief of Ignatius Press, asked Jan. 13.