The variety of Chaucer's tales shows the breadth of his skill and his familiarity with many literary forms, linguistic styles, and rhetorical devices. Medieval schools of rhetoric at the time encouraged such diversity, dividing literature (as Virgil suggests) into high, middle, and low styles as measured by the density of rhetorical forms and vocabulary. Another popular method of division came from St. Augustine, who focused more on audience response and less on subject matter (a Virgilian concern). Augustine divided literature into "majestic persuades", "temperate pleases", and "subdued teaches". Writers were encouraged to write in a way that kept in mind the speaker, subject, audience, purpose, manner, and occasion. Chaucer moves freely between all of these styles, showing favouritism to none. He not only considers the readers of his work as an audience, but the other pilgrims within the story as well, creating a multi-layered rhetoric.