Dont Bea Nero

60's San Francisco hippie slogan: "Thou Shalt Take Part In No Bad Scenes."

Rhymes with DontBeaHero, where you are extolled not to exceed the others in any dimension?

Don't fiddle while your project burns?

Don't castrate your boyfriend just because your mom broke up with you??

Don't build the most impressive works of engineering in Rome's history? On land freed up by a fire of mysterious origin...