This assumes that the main purpose of reading is always enjoyment. Often that is not the case; we read because we require the knowledge contained in the book fo

This assumes that the main purpose of reading is always enjoyment. Often that is not the case; we read because we require the knowledge contained in the book for our work. The converse of only engaging with a book on an emotional level and retaining only those details which are interesting is forgetting those parts which were difficult/boring but useful.