Paul explains the purpose for tongues very well EG. And he wants all to speak in tongues because of the value of this gift.
Does the church today have the same dunamis power as in the beginning? Some do. Many are awakening to it.
And it's why this move of Holy Spirit is called The Awakening. What if this had something to do with the 10 virgins?
I would offer... God is simply no longer bring new prophecy (the inspired word of God) after any manner that could be added to the book of prophecy .We have it in whole with a warning not to add or subtract from it.. (that which is sealed up till the end of time.)
Speaking in tongues which simply is prophecy spoken in another language. Languages men like the apostate Jews are not accustomed to . It is not the sign spoken of according to the law below as something one would seek after .
In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the LORD.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. 1Co 14:21
The sign of rebellion is towards those who will not hear prophecy. It speaks to them who would not hear prophecy . Why anyone would prefer a outward sign against them to me is a mystery?
For with stammering (Mocking) lips and another tongue will he speak to this people.To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear.Isa 28:11
Strongs lexicon.... 03934 la`eg {law-ayg'}
from 03932; TWOT - 1118b; adj
AV - mocker 1, stammering 1; 2
1) mocking 1a) mocker (noun cstr)
God does not mock prophecy
They hardened their heart apposing, rejecting prophecy and did not receive the Sabbath rest spoken of in Hebrew 4 .Not mixing faith in what they did hear or see.
Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it. For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works.And in this place again, If they shall enter into my rest. Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief:Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.Heb 4:1-7
They obviously did not hear just as we are informed in Isaiah 28 :11-12.The sign that God mocks them points to them . Not towards them that believe prophecy as God's will.