|Claude de la Colombiere, S.J and St. Margaret Mary|
Father Croiset, actuated by the incredible demand as manifested by the rapid disposal of so many repeated editions, conceived a project of writing a more comprehensive treatise on the devotion. It is likely that his plan was submitted to Blessed Margaret Mary.
Not only did it meet with her approval, but she became his correspondent and co-laborer, and her views of the devotion were incorporated into the monumental work which promised to be one of the most authentic and valuable that ever left the press. Alas, she was not to read its printed pages. As the work was nearing its completion Blessed Margaret Mary, after a holy life, fortified with the sacrament of Extreme Unction, died an edifying death, having received Holy Communion the day before. This took place on October 17, 1690, when she was in her forty-third year.