Speakers with tongues have no fellowship with the church and do not edify others.
No one can understand the one who speaks with a tongue when he stands to pray, to give thanks or to bless the Lord. So how can he enter into a life of sharing with the believers if they do not understand him? Therefore the Apostle says: “Otherwise, if you bless with the spirit, how will he who occupies the place of the uninformed say 'Amen' at your giving of thanks, since he does not understand what you say? For you indeed give thanks well, but the other is not edified” (vv.16, 17).