Each of the books and movies in the spiritual categories approaches the ideas of spirit and spirituality from different perspectives, thus allowing you to more fully explore the concepts while engaging more of yourself—both the left and right brains, subjective and objective reasoning, hands-on practical experience, and recreational reading that nonetheless informs and brings forth new ideas.
The recommended books about cats are both fiction and non-fiction, but all have something to offer both the cat lover and the student of life.
If you have not already read my article on the dangers of clumping clay kitty litters, please take the time to do so. You could save your cat's life.
If it fits within your preferences, I recommend that you try working on several different books at once. For example, try starting with two different workbooks, and alternate between writing in them—say, work on the spiritual workbook one day, and the mental/emotional one the next, or write in one for a week, then the other. Meanwhile, also be reading or viewing one of the fictional works I recommend, as well as one of the channeled works.
However, for the sake of those who like to approach things in an orderly, linear fashion, here is how I would recommend approaching these books.