(9) So likewise ye.--This is not the application of the foregoing, but the introduction of a third illustration, viz., the varieties of human language. The "tongue" here is simply the actual organ of speech, distinguished in the Greek, by the insertion of the article, from "tongues" which flow from the spiritual gift. If a human being does not use words that those spoken to understand, it is useless; such words pass as sounds into the air and are useless.

Verse 9. - Words easy to be understood; rather, distinguishable speech. Ye shall speak; rather, ye shall be (all the time) speaking. Into the air. Mere pulses of useless inarticulate breath, spoken ins Blaue hinein. Philo has the word aeromuthos one who speaks to the wind.

14:6-14 Even an apostle could not edify, unless he spoke so as to be understood by his hearers. To speak words that have no meaning to those who hear them, is but speaking into the air. That cannot answer the end of speaking, which has no meaning; in this case, speaker and hearers are barbarians to each other. All religious services should be so performed in Christian assemblies, that all may join in, and profit by them. Language plain and easy to be understood, is the most proper for public worship, and other religious exercises. Every true follower of Christ will rather desire to do good to others, than to get a name for learning or fine speaking.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.