The reason that [political correctness] is very troubling to me is that it's the very same thing that happened to the Roman Empire. They were extremely powerful. There was no way anybody could overcome them. But these philosophers, with the long flowing white robes and the long white beards, they could wax eloquently on every subject, but nothing was right and nothing was wrong. They soon completely lost sight of who they were.

As quoted in "Ben Carson thinks political correctness could lead U.S. to collapse like Rome", Salon (October 15, 2014)