In this paragraph he goes on to show how vain a thing the ostentation of speaking unknown and unintelligible language must be. It was altogether unedifying and unprofitable (Co1 14:6): If I come to you speaking with tongues, what will it profit you, unless I speak to you by revelation, or by knowledge, or by prophesying, or by doctrine? It would signify nothing to utter any of these in an unknown tongue. An apostle, with all his furniture, could not edify, unless he spoke to the capacity of his hearers. New revelations, the most clear explications of old ones, the most instructive discourses in themselves, would be unprofitable in a language not understood. Nay, interpretations of scripture made in an unknown tongue would need to be interpreted over again, before they could be of any use.

I.He illustrates this by several allusions. 1. To a pipe and a harp playing always in one tone. Of what use can this be to those who are dancing? If there be no distinction of sounds, how should they order their steps or motions? Unintelligible language is like piping or harping without distinction of sounds: it gives no more direction how a man should order his conversation than a pipe with but one stop or a harp with but one string can direct a dancer how he should order his steps, Co1 14:7. 2. To a trumpet giving an uncertain sound, adēlon phōnēn, a sound not manifest; either not the proper sound for the purpose, or not distinct enough to be discerned from every other sound. If, instead of sounding on onset, it sounded a retreat, or sounded one knew not what, who would prepare for the battle? To talk in an unknown language in a Christian assembly is altogether as vain and to no purpose as for a trumpet to give no certain sound in the field or day of battle. The army in one case, and the congregation in the other, must be all in suspense, and at a perfect nonplus. To speak words that have no significancy to those who hear them is to leave them ignorant of what is spoken; it is speaking to the air, Co1 14:9. Words without a meaning can convey no notion nor instruction to the mind; and words not understood have no meaning with those who do not understand them: to talk to them in such language is to waste our breath. 3. He compares the speaking in an unknown tongue to the gibberish of barbarians. There are, as he says (Co1 14:10), many kinds of voices in the world, none of which is without its proper signification. This is true of the several languages spoken by different nations. All of them have their proper signification. Without this they would be phōnai aphōnoi - a voice, and no voice. For that is no language, nor can it answer the end of speaking, which has no meaning. But whatever proper signification the words of any language may have in themselves, and to those who understand them, they are perfect gibberish to men of another language, who understand them not. In this case, speaker and hearers are barbarians to each other (Co1 14:11), they talk and hear only sounds without sense; for this is to be a barbarian. For thus says the polite Ovid, when banished into Pontus,

Barbarus hic ego sum, quia non intelligor ulli,

I am a barbarian here, none understand me.

To speak in the church in an unknown tongue is to talk gibberish; it is to play the barbarian; it is to confound the audience, instead of instructing them; and for this reason is utterly vain and unprofitable.

II.Having thus established his point, in the two next verses he applies, 1. By advising them to be chiefly desirous of those gifts that were most for the church's edification, Co1 14:12. "Forasmuch as you are zealous of spiritual gifts, this way it will become commendable zeal, be zealous to edify the church, to promote Christian knowledge and practice, and covet those gifts most that will do the best service to men's souls." This is the great rule he gives, which, 2. He applies to the matter in hand, that, if they did speak a foreign language, they should beg of God the gift of interpreting it, Co1 14:13. That these were different gifts, see Co1 12:10. Those might speak and understand a foreign language who could not readily translate it into their own: and yet was this necessary to the church's edification; for the church must understand, that it might be edified, which yet it could not do till the foreign language was translated into its own. Let him therefore pray for the gift of interpreting what he speaks in an unknown tongue; or rather covet and ask of God the gift of interpreting than of speaking in a language that needs interpretation, this being most for the church's benefit, and therefore among the gifts that excel; vide Co1 14:12. Some understand it, "Let him pray so as to interpret what he utters in prayer in a language unintelligible without it." The sum is that they should perform all religious exercises in their assemblies so that all might join in them and profit by them. 3. He enforces this advice with a proper reason, that, if he prayed in an unknown tongue, his spirit might pray, that is, a spiritual gift might be exercised in prayer, or his own mind might be devoutly engaged, but his understanding would be unfruitful (Co1 14:14), that is, the sense and meaning of his words would be unfruitful, he would not be understood, nor therefore would others join with him in his devotions. Note, It should be the concern of such as pray in public to pray intelligibly, not in a foreign language, nor in a language that, if it be not foreign, is above the level of his audience. Language that is most obvious and easy to be understood is the most proper for public devotion and other religious exercises.

Likewise ye - If ye do not speak in the Church so as to be understood, your labor is useless; ye shall speak into the air - your speech will be lost and dissipated in the air, without conveying any meaning to any person: there will be a noise or sound, but nothing else. Gifts of that kind, thus used, are good for nothing.

So likewise you, unless ye utter by the tongue words easy to be understood,.... This is an accommodation of the foregoing similes to the case in hand: for as unless there is a distinction of notes and tunes, it cannot be music, nor it cannot be known what is piped or harped; and unless the trumpet gives a certain sound, none can know when to prepare himself for the battle; so unless in the public ministry and service a language is spoken, and words made use of, which are understood without difficulty:

how shall it be known what is spoken? the subject matter of the discourse, prayer, or psalm, will be all lost, and therefore cannot be for edification, exhortation, or comfort:

for ye shall speak into the air; into which such words are resolved, and the use and benefit of them, as to others, cease with the breath, by which they are delivered: any part of divine service performed in such a way is all in vain, and to no purpose; it is all lost labour, it is beating the air, and talking to the wind. This condemns the practice of the Papists, performing divine service in a language not understood by the common people; and exposes the folly of those, who are fond of a florid style, of bombast words, great swelling words of vanity in their public discourses: this is only speaking into the air, with regard to the vulgar, whose edification should be consulted: and as the end of the Gospel ministry is public usefulness and edification, plainness of speech, words easy to be understood, should be used; such as are apt and fit to convey the true idea of things to people in common; these are the acceptable words, which the wise preacher, who is desirous of doing good to the souls of men, will seek out, and studiously make use of.

So . . . ye--who have life; as opposed to "things without life" (Co1 14:7).

by the tongue--the language which ye speak in.

ye shall speak--Ye will be speaking into the air, that is, in vain (Co1 9:26).