1 Corinthians 14:6

If I come to you, speaking with tongues in this manner, what shall I profit you, unless in revelation, &c. that is, unless I reveal, and expound to you the meaning, by some other gift, as in knowledge, in prophecy, in doctrine? To speak tongues only without interpreting, is no ways instructive. He that speaks to me, what I understand not, is not better than a barbarian to me, (so the Greeks called those that spoke not their language.) He signifies this inconvenience of not being understood, by the example of instruments, pipes, harps, trumpets, which would not move persons to different affections, nor excite them to different actions, unless the sound, and manner they were played upon, were different; seek, then, and endeavour to make use of the gifts of the Spirit, to edification of the Church, or of the hearers. (Witham)