If you’re narrating an event, set quotes off in their own paragraphs. Use fictional dialogue as a guide. It is confusing to read a paragraph in which a quote is wedged in the middle of exposition. It’s even more confusing to have two or more quotes from a person sprinkled in a paragraph. And quoting two or more people within one paragraph is unreadable.

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Quod “erat demonstrandum,” said Irving Euclid, a geometer at the University of Athens.