I notice that I only publish once every four years. It takes a couple of years to write a book and then, for me, for one reason or another, it usually takes about a year of sort of dicking around before I start up. I write a review or little magazine pieces and touring with the other book. But mainly it's just you're not ready, I'm not ready to start another. You're just not up for it.
I don't care if you are a good mathematician, or a good athletic, or not good at anything- that you think. But I'm gonna come and tell you that you're awesome the way you are.