Parallel
1 Corinthians 14:9
Clementine Vulgate · Berean Standard Bible
Ita et vos per linguam nisi manifestum sermonem dederitis : quomodo scietur id quod dicitur ? eritis enim in aëra loquentes.
So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air.