tongues and R

Hannah is not only my niece, but a member of my Sunday school audience of high school students. The other day, she asked if I'd do a lesson on speaking in tongues, a phenomenon that's mentioned here and there in Scripture but not emphasized in Baptist circles.

I've heard it done in ways that are sound and unsound, flaky and perhaps worthy. But it dawned on me recently what I've never ever heard, in any instance of glossolalia: the letter R.

What does that mean? Who knows? But there you have it. The Spirit apparently doesn't use any Rs.