"Fracastorius, a famous poet, freely grants all poets to be mad; so doth Scaliger; and who doth not? Aut insanit homo, aut versus facit (He's mad or making verses), Hor. Sat. vii. l. 2. Insanire lubet, i. versus componere. Virg. 3 Ecl.; so Servius interprets it, all poets are mad, a company of bitter satirists, detractors, or else parasitical applauders: and what is poetry itself, but as Austin holds, Vinum erroris ab ebriis doctoribus propinatum?"

Robert Burton, "The Anatomy of Melancholy"