Speaking in tongues – The gift of tongues is one of the temporary “sign gifts” given to the early Church to enable the gospel to be preached throughout the world to all nations and in all known languages. It involved the divine ability to speak in languages previously unknown to the speaker. This gift authenticated the message of the gospel and those who preached it as coming from God. The phrase “diversity of tongues” (KJV) or “different kinds of tongues” (NIV) effectively eliminates the idea of a “personal prayer language” as a spiritual gift.
Now there are varieties of gifts, but the same Spirit. And there are varieties of ministries, and the same Lord. There are varieties of effects, but the same God who works all things in all persons. But to each one is given the manifestation of the Spirit for the common good. For to one is given the word of wisdom through the Spirit, and to another the word of knowledge according to the same Spirit; to another faith by the same Spirit, and to another gifts of healing by the one Spirit, and to another the effecting of miracles, and to another prophecy, and to another the distinguishing of spirits, to another various kinds of tongues, and to another the interpretation of tongues. But one and the same Spirit works all these things, distributing to each one individually just as He wills. Bible Scripture Gift