Oh, yah, yah! My favorite passage! The one that compares the closed mind to the open mind, able to grow in the LORD! The Bereans were the ones who apparently didn't need any corrective epistles from Paul. Give them the Gospel and a Bible, and they're on their way. The Thessalonikans needed reminders about the rapture and the Man of Sin, not to worry, but be comforted by the Word. But they did come into line, as we ought.
And the ECFs -- those are the parasitics, right?