Blind poets

yes we hear about the verbose and articulate blind poet, but what about the fellow with a lisp? what about those wordy geniuses who can't speak or can't speak well? what about those who have so much to say but are to shy to do so? well maybe you got over stage fright back then because there was no writing but still... writing and literature helps/ed those brilliant people with speaking impediments even though it does nothing for those great blind speakers.