“Of the Twelve Principles the most important was the third: "The universe consists of atoms and void."
There is no extant text by Epicurus called the Twelve Principles. DeWitt came up with those on his own and gave his list the name of a lost text. I'm not saying "the universe consists of atoms and void" isn't a fundamental principle, but there is no way Dewitt should be saying it's "the third." Sorry. This aggravates me every time it comes up.