Among the Fathers it is
sententia communissima that the speaking with tongues was a speaking in foreign languages. Their interpretation is based upon the promise in
Mark 16:1, “They shall speak with new tongues”, and on its final fulfilment in the gift of tongues to the apostles (
Acts 2:4). A new tongue, however, is not necessarily a foreign language, and a gift which had a special use on the day of Pentecost appears purposeless in meetings of people of one language. There are, besides, textual objections to the common opinion, although, it must be owned, not quite convincing [see the second point above]. Many explanations of this obscure charisma are proposed, but not one of them is free from objection. It may indeed be that there is some
truth in all of them.
St. Paul speaks of “kinds of tongues”, which may imply that glossolalia manifested itself in many forms: e.g. in the form of foreign languages when required by circumstances, as with the Apostles; as a new language — “a kind of speech distinctive of the spiritual life and distinguished from common speech, which to the exuberant feeling of the new
faith appeared unsuitable for intercourse with
God” (Weizsacker); or as the manifestation of the unspeakable groanings of the
Spirit, asking for us, and causing us to cry, [“
Abba (
http://www.newadvent.org/cathen/01006d.htm), Father” (
Romans 8:15, 26).