Languages to Hear the Gospel

1 Corinthians 14:22-25   
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. 23 Therefore if the whole church comes together in one place, and all speak with tongues, and there come in those who are uninformed or unbelievers, will they not say that you are out of your mind? 24 But if all prophesy, and an unbeliever or an uninformed person comes in, he is convinced by all, he is convicted by all. 25 And thus the secrets of his heart are revealed; and so, falling down on his face, he will worship God and report that God is truly among you.

Because speaking in languages unknown to the speaker are God-given to convict, they are a sign to those not knowing Christ, without His presence living in them.  Those who already believe need exhortation, not conviction to salvation.  Yet if God’s word is revealed in the congregation, those unbelievers entering will find conviction in clear truth, not in a show of gifting.  If all entering only hear a jumble of multiple languages without interpretation, there is no value and no drawing to Christ.  But if truth is heard, hearts are convicted as they are convinced of their sinful and hopeless state before a holy God.  This is how the good news of Jesus’s atoning death and resurrection is heard to act on, and God gets glory and worship as He is seen in the congregation.