Pope Francis' last writings, a short foreword to a book on the church's teachings on love and marriage, have been published. In the foreword, Francis emphasizes the church's position that marriage is a sacred commitment between a man and a woman. He uses metaphors and symbols to convey spiritual lessons and connects with a wide audience. Francis also addresses the realities of marriage, acknowledging the statistical likelihood of divorce. While he didn't change doctrine, Francis sought to incorporate those who struggle to live by the church's teachings. His letter highlights some of his signature policies and could be considered by the committee that will decide if he will be canonized.