Sometimes you will need to leap from one end of this paradoxical spectrum to the other in a matter of minutes, and then back again. As I write this book, for instance, I approach each sentence as if the future of humanity depends upon my getting that sentence just right. I care, because I want it to be lovely. Therefore, anything less than a full commitment to that sentence is lazy and dishonorable. But as I edit my sentence--sometimes immediately after writing it--I have to be willing to throw it to the dogs and never look back. (Unless, of course, I decide that I need that sentence again after all, in which case I must dig up its bones, bring it back to life, and once again regard it as sacred.) It matters./It doesn't matter.