A Qualification of my Last Post

Upon reading this post from Bart Barber, I realized it might help for me to make a qualification of my last post. Instead of being directed only to "cessationists," I would like to pose the very same question as before, but also include as its intended recipients not only those who consider themselves to be "cessationists," but also all those who, for whatever reason, believe that the practice of "private prayer languages" is unbiblical.