This is from the blog Narrative. He quotes an excellent book on writing - Writing With Power - and what he is saying and quoting goes to the core of the notion of "wild exactitude"
To write is to overcome a certain resistance: you are trying to wrestle a steer to the ground, to wrestle a snake into a bottle, to overcome a demon that sits in your head. To succeed in writing or making sense is to overpower that steer, that snake, that demon. But not kill it.
This myth explains why some people who write fluently and perhaps even clearly—they say just what they mean in adequate, errorless words—are really hopelessly boring to read. There is no resistance in their words; you cannot feel any force being overcome, any orneriness. No surprises. The language is too abjectly obedient. When writing is really good, on the other hand, the words themselves lend some of their energy to the writer. The writer is controlling words he can’t turn his back on without danger of being scratched or bitten.