Too funny, if you could just
not put "ecstatic utterence" in the place of "tongues" and just read it as "language" you would see the entire doctrine falls apart.
I don't, and it still doesn't.
Of course if someone is speaking a foreign language, common in Corinth btw and no one understands him/her then understanding is only limited to himself.
Why you may ask....because it is his natural language so he understands what he is saying.
This is very common sense instruction about how to deal with such a mixed congregation with various languages....sad how it has been hyper-spiritualized
The context is how to use the gifts of the Spirit in a congregational context, though the instructions in chapter 14 also apply to learned languages. If you're the only person who speaks/understands a language in a particular venue, don't speak in that language. Speaking in one's learned natural language is not a gift of the Holy Spirit. Speaking in a learned second language, or interpreting from it, also is not a gift of the Holy Spirit. The Holy Spirit certainly may empower someone to speak in the local language but that doesn't seem to be what Paul is primarily addressing.