1 Corinthians 14:19
Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue. Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue.
In the church, five words spoken with understanding that teach others are better than ten thousand words in an unknown tongue, because intelligible speech teaches others and edifies the church. A few such words are more useful than many unintelligible words for this reason. Speech in worship must therefore be easy to be understood, clear, distinct, and audible, so that others are taught and edified and can respond. It must not be speaking into the air with uncertain, unintelligible sound.
The same principle applies to the use of the voice in prayer and testimony in social meeting. The voice is a gift to be consecrated to God and cultivated, educated, and disciplined, so that what is said edifies the church. The habit of speaking in a low, indistinct way is a defect to be earnestly overcome in order to honor God and edify the church and His children. Prayer in social meeting should be simple, clear, comprehensive, and full of life, not long, spiritless, formal, low, or indistinct. Being defective in voice does not require a person to stop offering public prayer or bearing witness to the power and love of Christ.