The Voice and Diction of Conversation : Page 84

In voice and diction, as in many other things, nature tends to supply or to supplement what one intelligently needs and tries to use. If a person thinks clearly and honestly, feels sincerely and justly, and then tries to convey this to his fellow men for their good and their amusement, he will hardly talk too low or too loud, drawl monotonously or rattle disconnectedly. If he prizes both his ideas and his fellow men, nature will help him with enough voice and diction to bring his ideas and his neighbors together — forcefully and pleasantly.