Lastly, about a year ago I had a related dream. I'll keep it short and simple: 
I was in a church building, I got the impression in my spirit that a man wasn't saved and I go over to him to witness. It turns out that he could pray in tongues! Because of that, I ignored the RUACH and did not witness to the man. Then I hear demons mocking, laughing, saying they FOOLED the man and others (including the saints) into believing the man was born again. 
The gift of diverse tongues is both Heavenly and Earthly languages (1 Cor 13:1; 14:21-22; Rom 8:26). Both the gift of tongues and the interpretation thereof are for the edification of the church (1 Cor 14:5, 9-23). 1 Cor 14:28 says "If there be no interpreter, let him keep silence in the church; and let him speak to himself, and to YAHUVEH". The gift of tongues can be a sign to unbelievers (1 Cor 14:22), BUT only if the unbeliever understands the language (1 Cor 14: 11; 14:23). For example, read what happened on the day of Pentecost in Acts 2:11. 
The prayer language is mainly for self edification (1 Cor 14:4). It stirs up the anointing during worship (1 Cor 14:14-16; Ephesians 5:18-20) and aids in prayer (Romans 8:26-27). In 1 Corinthians 14: 19 the Apostle Paul says, "in the church I would rather speak five intelligible words to instruct others than ten thousand words in a tongue". But, it is perfectly acceptable to pray in tongues during ministry because tongues stirs up the anointing to aid in ministry (1 Cor 14:6-8), to bring a revelation, a word of knowledge, a word of wisdom, a prophecy or a word of instruction, (1 Cor 14:6). 
Glossolalia,  otherwise referred to as “speaking in tongues, ” has been around for thousands of years, and references to it can be found in the Old and New Testament.
Research shows that these people are not in control of the usual language centers during this activity, 
which is consistent with their description of a lack of intentional control while speaking in tongues. These findings could be interpreted as the subject’s sense of self being taken over by something else.
1 Corinthians 12:7-11
7 But the manifestation of the Spirit is given to every man to profit withal.
8 For to one is given by the Spirit the word of wisdom; to another the word of 
knowledge by the same Spirit; 
9 To another faith by the same Spirit; to another the gifts of healing by the 
same Spirit; 
10 To another the working of miracles; to another prophecy; to another 
discerning of spirits; to another divers kinds of tongues; to another the 
interpretation of tongues: 
11 But all these worketh that one and the selfsame Spirit, dividing to every man 
severally as he will.
1 Corinthians 13:1
1 Though I speak with the tongues of men and of angels, and have not 
charity, I am become as sounding brass, or a tinkling cymbal. 
1 Corinthians 14:1-19
1 Follow after charity, and desire spiritual gifts, but rather that ye may 
prophesy. 
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. 
3 But he that prophesieth speaketh unto men to edification, and exhortation, and 
comfort. 
4 He that speaketh in an unknown tongue edifieth himself; but he that 
prophesieth edifieth the church. 
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.
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? 
7 And even things without life giving sound, whether pipe or harp, except they 
give a distinction in the sounds, how shall it be known what is piped or harped?
8 For if the trumpet give an uncertain sound, who shall prepare himself to the 
battle? 
9 So likewise ye, except ye utter by the tongue words easy to be understood, how 
shall it be known what is spoken? for ye shall speak into the air. 
10 There are, it may be, so many kinds of voices in the world, and none of them 
is without signification. 
11 Therefore if I know not the meaning of the voice, I shall be unto him that 
speaketh a barbarian, and he that speaketh shall be a barbarian unto me. 
12 Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may 
excel to the edifying of the church.
13 Wherefore let him that speaketh in an unknown tongue pray that he may 
interpret. 
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. 
16 Else when thou shalt bless with the spirit, how shall he that occupieth the 
room of the unlearned say Amen at thy giving of thanks, seeing he understandeth 
not what thou sayest? 
17 For thou verily givest thanks well, but the other is not edified. 
18 I thank my God, I speak with tongues more than ye all: 
19 Yet in the church I had rather speak five words with my understanding, that 
by my voice I might teach others also, than ten thousand words in an unknown 
tongue.
1 Corinthians 14:22-25
22 Wherefore tongues are for a sign, not to them that believe, but to them 
that believe not: but prophesying serveth not for them that believe not, but for 
them which believe. 
23 If therefore the whole church be come together into one place, and all speak 
with tongues, and there come in those that are unlearned, or unbelievers, will 
they not say that ye are mad? 
24 But if all prophesy, and there come in one that believeth not, or one 
unlearned, he is convinced of all, he is judged of all: 
25 And thus are the secrets of his heart made manifest; and so falling down on 
his face he will worship God, and report that God is in you of a truth.
26 How is it then, brethren? when ye come together, every one of you hath a 
psalm, hath a doctrine, hath a tongue, hath a revelation, hath an 
interpretation. Let all things be done unto edifying. 
27 If any man speak in an unknown tongue, let it be by two, or at the most by 
three, and that by course; and let one interpret. 
28 But if there be no interpreter, let him keep silence in the church; and let 
him speak to himself, and to God. 
Acts 2:1-13
1 And when the day of Pentecost was fully come, they were all with one 
accord in one place. 
2 And suddenly there came a sound from heaven as of a rushing mighty wind, and 
it filled all the house where they were sitting. 
3 And there appeared unto them cloven tongues like as of fire, and it sat upon 
each of them. 
4 And they were all filled with the Holy Ghost, and began to speak with other 
tongues, as the Spirit gave them utterance.
5 And there were dwelling at Jerusalem Jews, devout men, out of every nation 
under heaven. 
6 Now when this was noised abroad, the multitude came together, and were 
confounded, because that every man heard them speak in his own language. 
7 And they were all amazed and marvelled, saying one to another, Behold, are not 
all these which speak Galilaeans? 
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? 
13 Others mocking said, These men are full of new wine.
Acts 10:44-47
44 While Peter yet spake these words, the Holy Ghost fell on all them which 
heard the word. 
45 And they of the circumcision which believed were astonished, as many as came 
with Peter, because that on the Gentiles also was poured out the gift of the 
Holy Ghost. 
46 For they heard them speak with tongues, and magnify God. Then answered Peter,
47 Can any man forbid water, that these should not be baptized, which have 
received the Holy Ghost as well as we? 
Acts 19:6-7
6 And when Paul had laid his hands upon them, the Holy Ghost came on them; and 
they spake with tongues, and prophesied. 
7 And all the men were about twelve.
Mark 16:18
16 He that believeth and is baptized shall be saved; but he that believeth 
not shall be damned. 
17 And these signs shall follow them that believe; In my name shall they cast 
out devils; they shall speak with new tongues; 
18 They shall take up serpents; and if they drink any deadly thing, it shall not 
hurt them; they shall lay hands on the sick, and they shall recover.