Institutio Oratoria

Nor can I regard as an error the assertion that order is essential to the existence of nature itself, for without order everything would go to wrack and ruin. Similarly if oratory lack this virtue, it cannot fail to be confused, but will be like a ship drifting without a helmsman, will lack cohesion, will fall into countless repetitions and omissions, and, like a traveller who has lost his way in unfamiliar country, will be guided solely by chance without fixed purpose or the least idea either of starting-point or goal.