In the same spirit of imitation — and adaptation — of classical sources that had informed the poetic compositions of "La Pléiade", French humanist writers recommended that tragedy should be in five acts and have three main characters of noble rank; the play should begin in the middle of the action (in medias res), use noble language and not show scenes of horror on the stage. Some writers (like Lazare de Baïf and Thomas Sébillet) attempted to link the medieval tradition of morality plays and farces to classical theater, but Joachim du Bellay rejected this claim and elevated classical tragedy and comedy to a higher dignity. Of greater difficulty for the theorists was the incorporation of Aristotle's notion of "catharsis" or the purgation of emotions with Renaissance theater, which remained profoundly attached to both pleasing the audience and to the rhetorical aim of showing moral examples (exemplum).