A sign is most certainly a miracle that will have most people change their mind and believe in God.
But my question still is, how does speaking things that i don't understand a sign to me? a sign for what? what i'm i supposed to do after you spoken things to me that i don't understand?
But my question still is, how does speaking things that i don't understand a sign to me? a sign for what? what i'm i supposed to do after you spoken things to me that i don't understand?
21 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.
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?
Notice the 'logical connectors' here in the passage. Notice 'wherefore' in 'Wherefore tongues are for a sign...' This connects back to the previous verse which tells us that when the LORD speaks with men of other tongues and other lips, the people do not hear.
Notice also 'If therefore...' The hypothetical scenario of the unlearned or unbeliever hearing tongues and thinking all are mad is logically connected to the verse about tongues being a sign, which is connected to the verse about people not hearing when God speaks through men of other lips and other tongues.
So Paul is making a difficult argument for many people to follow. It certainly was to me. The Lord will speak through men of other tongues...wherefore tongues are for a sign... if therefore the whole church be come together...and there come in...unlearned or unbelievers, will they not say that ye are made.
Tongues are a sign to them that believe not, but them that believe not, and respond with unbelief? What is that about? I'm not the one who made the argument originally. It's in I Corinthians. So the question is, what is Paul saying? Why would Paul quote about people NOT hearing God through tongues, then say tongues are for a sign, and give an example of an unbeliever rejecting speaking in tongues as madness?
I believe to understand this it is helpful to look back at Deuteronomy. If a prophet gives a sign in the name of the Lord that does not come to pass, the people could reject him as a false prophet. Prophets would give signs at times. When X is fulfilled, that is a sign that Y will take place. Isaiah asked for a sign that he would go up to the house of the Lord. At that time, he was dying on a sick bed, and he wanted a sign that he would survive. Isaiah asked him if he wanted a shadow to move forward or backward. He said backward. So however it happened, the sun moving back or the palace moving or whatever, the shadow moved. When that short-term prophecy was fulfilled it was a sign that the longer term survival, his going up to the house of the LORD (which implied his recovery) would take place.
Jesus had just miraculously fed large numbers of people, but the people came to Him asking for a sign. They probably wanted Him to predict a future event to confirm His prophethood, following their interpretation of Deuteronomy. He rebuked them saying an evil and adulterous generation sought a sign. Their hearts were not right, and yet they were demanding a sign. But He would only give them one sign of a future event, the sign of the prophet Jonah, which spoke of His resurrection.
So one type of sign is a fulfilled prophecy. When unbelievers or the unlearned witness speaking in tongues, and reject it as madness, we see a fulfillment of '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."--which is a fulfilled prophecy, a sign against them.
That's how I interpret the passage.
Usually, I would agree with you that certain individuals, depending on their hearts, respond to signs that confirm the word with faith. Sergius Paulus believed after seeing Elymas blinded, for example. Jesus said, "Except ye see signs and wonders, ye shall not beleive' before healing a man. But that is not what Paul says about speaking in tongues. Even in Acts 2, there were scoffers who accused the disciples of being drunk when they spoke in tongues.