diversity?

[allstate1]

Originally Posted by proudfather

Now I would suggest that you read 1 Cor. 14 in it's entirety.

20 Brethren, do not be children in understanding; however, in malice be babes, but in understanding be mature.
21 In the law it is written:


“ With men of other tongues and other lips
I will speak to this people;
And yet, for all that, they will not hear Me,”[b]

says the Lord.
22 Therefore tongues are for a sign, not to those who believe but to unbelievers; but prophesying is not for unbelievers but for those who believe.

Now, go back to verse 14.

14 For if I pray in a tongue, my spirit prays, but my understanding is unfruitful. 15 What is the conclusion then? I will pray with the spirit, and I will also pray with the understanding. I will sing with the spirit, and I will also sing with the understanding.

18 I thank my God I speak with tongues more than you all; 19 yet in the church I would rather speak five words with my understanding, that I may teach others also, than ten thousand words in a tongue.

If tongues are merely a sign to the unbeliever, then why would Paul want to pray "in the spirit" in private?

2 questions on this post! If tongues are the evidence of the Holy Ghost and the sign of salvation in the UPC why would Paul rather do it in private?? Who would know he is saved? Also what does the unbeliever here not believe in? Tongues or does he not believe the person speaking in tongues is saved?