Christ in Mark 16:17 promises the gift of speaking intongues to be one of the signs that will accompany those that believe, and in Acts of the Apostles we saw the manifestation of that promise, but what happened on the day of pentecost was that people understood those languages {tongues} to be foreign voices unknown to the speakers.
coming in today christian world where speaking in tongues have become order of the day, but in a different dimension that could not be understood, i think it's important for people that don't understand it be carried along.

I understood what the Bible says about this phenomenon, comment please.
not just comment without bible to support your stand.

God bless as you contribute meaningfully.