Aristotle,
The Poetics — 2
(1909)
“ Those, however, who make use of the Spectacle to put before us that which is merely monstrous and not productive of fear, are wholly out of touch with Tragedy; not every kind of pleasure should be required of a tragedy, but only its own proper pleasure.The tragic pleasure is that of pity and fear, and the poet has to produce it by a work of imitation; it is clear, therefore, that the causes should be included in the incidents of his story. ”
