I'm far from sure that the book is perfect. What I am pretty sure about - as sure as I'm going to get - is that this is my best crack at it, the closest I am capable of getting to the shining platonic form of this story in my head. This is, honest to god, my very best work to date. If it's not good enough, well, so be it, and I may as well find that out...but if it's not good enough, it won't be because I could do better.
And anyway, it might be good enough. There exists that faint, tantalizing possibility.