FightingAtheism
If speaking in tongues is speaking in earthly languages, then why does the Bible mention the gift of interpretation (1 Cor. 12)? And 1 Cor 12:2,14,15 would clearly contradict.
Anyways, here's a clear definition of tongues:
2 For he that speaketh in an [unknown] tongue speaketh not unto men, but unto God: for no man understandeth [him]; howbeit in the spirit he speaketh mysteries.
(1Co.14:2)
14 For if I pray in an [unknown] tongue, my spirit prayeth, but my understanding is unfruitful.
15 What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
(1Co.14:14,15)
Don't see the connection in 1 Co 12,so let's look at the definition you provided.
I Corinthians 14:2 "For he that speaketh in an [unknown] tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries."
"Mysteries" as given in the Greek text is "divine secrets"; so why would he be speaking in divine secrets? Note also that the word "unknown" was added by the translators for it just wasn't there in the early manuscripts.
Corinthians 14:4 "He that speaketh in an unknown tongue edifeth himself; but he that prophesieth edifieth the church."
If I went to a foreign land and taught this chapter in English, where no one knows the English language, the only one that would be built up by what I said would be me. However, if I went to a church that spoke English and taught in the English, the entire church would be edified or built up by those same words. If you are truly teaching the Word of God to the body of Christ and speaking in their language, then they would gain from what you would say.
One of the gifts of the Holy Spirit is to be able to learn another tongue or language than you were brought up with, so that you can teach someone who is not of your language
I Corinthians 14:5 "I would that ye all spake with tongues, but rather that ye prophesied: for greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying."
Paul is saying that he wished that all of his brethren there in Corinth could speak in as many languages as I can speak. However, I would rather that you would be gifted teachers in the Word of God, then to speak in many languages and not be able to teach. In other words, if someone that teaches under the inspiration of the Holy Spirit desires to teach in another tongue, do it with the same emotion, devotion and love that you would in your native tongue. If you cannot do this, then find an interpreter that is also filled with the Spirit of God, and have him interpret so that the church may receive the edifying when they hear you. The whole point that Paul is saying here is that if you can't be understood, then you will not be doing much good. It is just plain common sense.
So what is the subject here, what are you saying? The subject is stated in verse twelve also, for it is taking for the gifts of teachering, evangelist, faith, and all the other gifts that take forth the gospel of Jesus Christ to the lost.
I Corinthians 14:6 "Now, brethren, if I come unto you speaking with tongues, what shall I profit you, except I shall speak to you either by revelation, or by knowledge, or by prophesying, or by doctrine?"
Paul is saying that if I come to you with great revelations and knowledge speaking in a in a language that that you do not understand, what will it profit you? Of course if you cannot understand what is being said in that foreign tongue, it will be nothing more than a turkey call. You wouldn't know if it was prophesying, doctrine, or knowledge.
I Corinthians 14:13 "Wherefore let him that speaketh in an unknown tongue pray that he may interpret."
Let him that speaks in an unnatural language pray that what he says will be interpreted properly. Before you go to speak to foreigners, pray that God will give you the understanding of that language before you go. If you go without this preparation, you are wasting your time.
I Corinthians 14:14 "For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful."
If you pray in a language that your mind doesn't understand, then of what benefit is your prayer. You uttered words that mean nothing, and have created nothing but noise. When you pray to the Father, know exactly who you are praying to and for what purpose. However if you are just muttering words and sounds that have no meaning, your prayer is in vain. In short, you have to be able to communicate, before people know what you are saying. Remember that this chapter is dealing with teaching those that are foreigners to you, and those that do not speak your language. The ability to communicate is a gift from God.
http://www.theseason.org/1corin/1corin14.htm
There is nothing unknown when the Holy Spirit speaks through you