I think in this quote, Zeus is referring to the fire as the "evil thing in which they may take pleasure to their gut," because he refers to it right before he uses the word evil to describe it.
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That one can breed another. Romeo and Juliet's families hatred of one another ends with them falling in love, and their love breeds new hatred and violence.
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this made me happy at the end but this is so sad though! You did great!
