Treasury of Scripture Knowledge
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.
1 Corinthians 14:4
He who speaks in an unknown tongue does good to himself, but he who prophesies does good to the Church.
1 Corinthians 12:7
But to each of us a manifestation of the Spirit has been granted for the common good.