After much study on the subject and of some of the proponents of "Speaking in Tongues" I've discovered there are at least four distinct definitions of the subject: (1) speaking in tongues is a known language used as a sign to unbelievers that what the speaker is saying is from God: I Cor. 14:22; (2) speaking in tongues is the initial evidence of the indwelling of the Holy Spirit: Kenneth Hagin and others of the traditional Pentecostal and modern charismatic movements; (3) speaking in tongues is a Heavenly language used to communicate to God in prayer: I Cor. 14:14, 15; and (4) speaking in tongues is a mystical sound, often guttural, historically associated with paganism and often used for communication between the user and some spiritual power be it Heavenly or Satanic.
If speaking in tongues is so important to our spirituality or indeed our salvation, it behooves us to ask the following questions concerning this subject:
(a) Why didn't Jesus ever speak in tongues or instruct anyone to do so?
(b) When Jesus gave instructions on prayer, why didn't he mention "speaking in tongues?", but instead said:
"when ye pray, use not vain repetitions, as the heathen
do: for they think that they shall be heard for their much speaking. "
8Be not ye therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him.
9After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.
10Thy kingdom come. Thy will be done in earth, as
it is in heaven.
11Give us this day our daily bread.
12And forgive us our debts, as we forgive our debtors.
13And lead us not into temptation, but deliver us from evil: For thine is the kingdom, and the power, and the glory, for ever. Amen."
(c) if "Speaking in Tongues" is the "initial evidence of the indwelling Holy Spirit", as many preachers teach, and without the Spirit one is not saved (Romans 9 "But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.") then why is one's depending upon "Speaking in Tongues" for salvation any different than depending upon baptism for salvation?
(4) Why isn't the obvious conclusion of the reasoning of (2) and (c) above not only sacrilegious but also blasphemous? and concerning Paul's words in I Cor. 14:15 ... didn't he say it's "unfruitful?"
First Corinthians was a letter written by the Apostle Paul to the Church at Corinth as a scathing rebuke of its practices of worship contrary to the teachings of Paul and was NOT a primer on "Speaking in Tongues." They were engaging in all kinds of immoral acts like: getting drunk at the communion table and even engaging in incest, among them! These immoral acts surely would have grieved the Holy Spirit so badly that anything done "in the spirit", so-called, as "speaking in tongues", would have been a spiritual impossibility.
"Speaking in tongues" as it is used in the charismatic movement today is an emphasis on SELF succumbing to PRIDE. It's also an emphaisis on the Holy Spirit in a direct contradiction to what Jesus said in John 16; "
13Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself..." Notice, "he shall not speak of himself! The Holy Spirit will emphasize Christ not Himself as in, Paul's words: "puffing up" the believer by "speaking in tongues."
Finally, Speaking in Tongues is a "known language" as in the Day of Pentecost, Acts 2:"
8 And how hear we every man in our own tongue, wherein we were born?
9 Parthians, and Medes, and Elamites, and the dwellers in Mesopotamia, and in Judaea, and Cappadocia, in Pontus, and Asia,
10 Phrygia, and Pamphylia, in Egypt, and in the parts of Libya about Cyrene, and strangers of Rome, Jews and proselytes,
11 Cretes and Arabians, we do hear them speak in our tongues the wonderful works of God.
12 And they were all amazed, and were in doubt, saying one to another, What meaneth this?"
And besides, can't we agree that God can understand English? French? Spanish? German and so on? Has "Our Daily Bread", the booklet that so many Christians of all denominations use as a daily devotional ever even mentioned "Speaking in Tongues?" Even Oswald Chambers, author of "My Utmost For His Highest" discounted the idea of "Speaking in Tongues" as evidence of the indwelling Holy Spirit.
http://media.colonial.org/files/PDFs/CBC/20131013-pm.pdf