I think this was in Frum's book or possibly Woodward's or maybe it was Simon's. Anyway, the story is that before his Address to Congress and the Nation on September 20, 2001 he was hearing all the media and pundits talk about how "this has to be the speech of his life." His response to all this was that he's given the "speech of his life" so many times now that it doesn't mean anything. Even Tony Blair was a bit awestruck with how comfortable the President was during the hours leading up to the speech. Evidently, he suggested to Bush that he take some time for himself and practice or think about his speech. Bush just said, "no, I know what I want and have to say."
I think this was in Woodward's book.
Sorry for delayed response.....got a phone call, then got distracted on this and other threads.....thanks for your post; yes, GW displays exactly what it is he wants to say, and that he means every word. I must keep repeating myself: how unlike his predecessor GW certainly is, and I'm so very glad.