The Book of the Spirit is one of the works of Imam Ibn Qayyim al-Jawziyyah, and it is one of the rare and dear books in its field, as it is the only book in our hands today that is classified according to the approach of the predecessors regarding the issue of the soul. The author touched on the issue of the soul, its reality, and its conditions in the isthmus. With an understanding of most of the sayings, and an emphasis on jokes, benefits, topics, and sayings that cannot be found in any other book at all.