Reflections on Writing - Plan
You have to have a plan. It is more important to know the ending than to know the beginning. The beginning can always be adapted, modified or changed. But the ending is where you are heading.
Reflections on Writing - Write
You have to write. Thinking about writing, developing a plan about writing, talking about writing or dreaming about writing is important. However, putting pen to paper is the only way to complete a book.