There are two main reasons people want to write a book. One is for Profit and the other is for a purpose or passion. For those who write books for profit, their main goal is to earn a living or create a new income stream from their writing. On the other hand, those who write for a purpose or passion are driven by a desire to share their knowledge, experiences, or perspectives with others and make a positive impact in the world. Your reasons for writing a book could be a bit of both, Passion, and Profit. You may have said one or two of these phrases below.