Then why must tongues be interpreted for the church to be edified?
1: a sign - the Bible evidence of baptism of the Holy Spirit - rivers of living water flowing through a disciple who has truly
received the indwelling Spirit of God - a spiritual prayer language.
Praying in the Spirit builds up the faith of a disciple and allows the Holy Spirit to burn up the chaff; strengthens & renews the
inner person.
2: the operation of the gift of diversity of tongues is within the Church - specifically at a formal worship/communion
meeting when the saints come together - 1Corinthians 12 & 14
The gift of diversity of tongues is spoken and then immediately followed by the gift of interpretation - up to three times maximum;
then there ought to be up to three gifts of prophecy one after another.