Here's an article about commitment. I found it really interesting. It pertains to writing very easily.
When we start a new book, it's like being strapped into a brand new rollercoaster. You have no idea where you are going. Will this book be published? But you have to be committed to see it to the end.
This is also true in life as this writer points out. You have to be committed to your life, to your marriage, to your kids, to your career.
No use doing something half way right? So write that book. Revise that book. Get feedback on it. Rewrite it. Polish it.
Send it out. There is no use spending that much time on something if you don't plan on sending it out. Why would you put that much effort into something if you don't plan on trying to get it published?
I guess there is art for art's sake, but I'm not one of those.
So send it out!
Make a commitment to that book. See it through until the end.