The BBC World Book Club is a treasure trove of author interviews that I was exposed to by The Learned One. I listen to them over breakfast and lunch.
Here's a quote from Richard Ford's interview that interested me.
Being a writer is not a profession. Being a writer is a vocation. It runs on a line that is coterminous with your life. It covers your life. Your life covers it. You’re not promised that vocation to the end of your life. It can stop and your life can go on.
I hope I have the temerity, I hope I have the good sense to say to myself, “You’ve done this as well as you can do it. Go do something else while there is any time left for you.”
Any book you don’t write, that’s OK. It doesn’t get held against you.