Margaret C. Conkling, The American Gentleman's Guide to Politeness and Fashion
“ The principal requisites of Letters of Business are, intelligibility, legibility, and brevity. To secure the first of these essentials, a clear, concise, expressive selection of language is required. Each word and sentence should express exactly and unequivocally the idea intended to be conveyed, and in characters that will not obscure the sense by doubtful legibility. A legible hand should certainly be as essential as intelligible utterance. ”
