Writing a book is a lot like getting married. You have to make a commitment and invest time and energy in the relationship. And you have to be prepared to stick it out “for better or worse.”
It all starts with the honeymoon phase. That’s when you get an idea for a sure-fire bestseller. Just like you can’t keep your mind 
off your new spouse, you can’t quit thinking about your story. You start drafting chapters and conducting research fuelled by a rush of adrenaline.
Then months, or perhaps years, later you’ve completed one — or more likely — many drafts of the story. It’s not so much fun now. You have to work hard to keep up your interest.
You’ve read some of the paragraphs so many times the words no longer seem to have any sparkle. And sometimes you secretly wonder if it would be better to just quit and start all over.
But you made a vow and are determined to keep it. You slog away and then one day you look at your manuscript and think, “Hey, this isn’t as bad as I thought it was. There are definite possibilities here.”
Somehow things seem easier now. By struggling through the rough times, you’ve made your story stronger. You no longer think about hitting the delete button. You want to see this one to the end.