The Art of Poetry: To the Pisos (99)

It is not enough that poems be beautiful;[*] let them be tender and affecting, and bear away the soul of the auditor whithersoever they please. As the human countenance smiles on those that smile, so does it sympathize with those that weep. If you would have me weep you must first express the passion of grief yourself; then, Telephus or Peleus, your misfortunes hurt me: if you pronounce the parts assigned you ill, I shall either fall asleep or laugh.

Pathetic accents suit a melancholy countenance; words full of menace, an angry one; wanton expressions, a sportive look; and serious matter, an austere one. For nature forms us first within to every modification of circumstances; she delights or impels us to anger, or depresses us to the earth and afflicts us with heavy sorrow: then expresses those emotions of the mind by the tongue, its interpreter. If the words be discordant to the station of the speaker, the Roman knights and plebians will raise an immoderate laugh. It will make a wide difference, whether it be Davus that speaks, or a hero; a man well-stricken in years, or a hot young fellow in his bloom; and a matron of distinction, or an officious nurse; a roaming merchant, or the cultivator of a verdant little farm; a Colchian, or an Assyrian; one educated at Thebes, or one at Argos.

You, that write, either follow tradition,[*] or invent such fables as are congruous to themselves. If as poet you have to represent the renowned Achilles; let him be indefatigable, wrathful, inexorable, courageous, let him deny that laws were made for him, let him arrogate every thing to force of arms Let Medea be fierce and untractable, Ino an object of pity, Ixion perfidious, Io wandering, Orestes in distress.