In chapter 15 of up from slavery why did Washington advise public speakers to forget all about rules?

In 'Up From Slavery,' Booker T. Washington believed it was best to throw out all the rules of public speaking in order to speak from the soul. He believed it was much better to present a relaxed speech, which didn't pay attention to the rules of language and public speaking, because it caused a relaxed atmosphere that made the listeners forget them too.