An artist must only judge of what he understands, his field is just as limited as that of any other specialist... That in his sphere there are no questions, but only answers, can only be maintained by those who have never written and have had no experience of thinking in images.
There is a difference between responsible criticism that aims for success and defeatism that refuses to acknowledge anything but failure. Hindsight alone is not wisdom, and second-guessing is not a strategy.
Either criticism is no good at all (a very defensible position) or else criticism means saying about an author the very things that would have made him jump out of his boots.
It is the beginning of all true criticism of our time to realize that it has really nothing to say, at the very moment when it has invented so tremendous a trumpet for saying it.