For if the trumpet give an uncertain sound - The trumpet was used commonly in war. It is a well-known wind instrument, and was made of brass, silver, etc. It was used for various purposes in war - to summon the soldiers; to animate them in their march; to call them forth to battle; to sound a retreat; and to signify to them what they were to do in battle, whether to charge, advance, or retreat, etc. It therefore employed a "language" which was intelligible to an army. An uncertain sound was one in which none of these things were indicated, or in which it could not be determined what was required.

Who shall prepare himself ... - The apostle selects a single instance of what was indicated by the trumpet, as an illustration of what he meant. The idea is, that foreign tongues spoken in their assembly would be just as useless in regard to their duty, their comfort, and edification, as would be the sound of a trumpet when it gave one of the usual and intelligible sounds by which it was known what the soldiers were required to do. Just as we would say, that the mere beating on a drum would he useless, unless some tune was played by which it was known that the soldiers were summoned to the parade, to advance, or to retreat.

If the trumpet give an uncertain sound - If, when the soldier should prepare himself for the battle, the trumpet should give a different sound to that which is ordinarily used on such occasions, the soldier is not informed of what he should do, and therefore does not arm himself; consequently, that vague, unintelligible sound of the trumpet, is of no use.

For if the trumpet give an uncertain sound,.... That is not plain and manifest, so as that it cannot be known on what account it is given:

who shall prepare himself to the battle? the allusion is to the custom of many nations, Jews and others, who, when about to engage in war, made use of musical instruments, particularly the trumpet, to gather the soldiers together, prepare them for the battle, give them notice of it, and animate them to it (y); the sound of the trumpet was the alarm of war; see Jeremiah 4:5. And particularly the allusion may be to the two silver trumpets, ordered by God to Moses for the Jews, which were to be made of a whole piece, and to be used for the calling of the assembly, and for the journeying of the camps, and to blow an alarm with when they went to war against the enemy, Numbers 10:1 and were a lively emblem of the Gospel, whose use is to gather souls to Christ, to direct saints in their journeying, and to prepare and animate them for battle, with their spiritual enemies; and of which use it is, when it gives a certain and even sound, as it does when clearly and rightly blown; and that is, the sound of love, grace, and mercy, to the sons of men, through a bleeding Saviour; salvation alone by a crucified Jesus, peace and pardon by his blood, justification by his righteousness, and atonement by his sacrifice; when it is blown aright, it blows a blast on all the goodliness of man, it magnifies the grace of God, exalts the person of Christ, debases the creature, shows its impurity, imperfection, and inability; and expresses the nature, use, and necessity of efficacious grace; and puts believers on doing good works for necessary uses, but not for life, righteousness, and salvation; and so its sound is equal, even, and certain: and when it is so, it is a means of gathering souls to Christ, the standard bearer and ensign of the people; and of engaging them to enlist themselves as volunteers in his service; and of animating them to fight under his banner the battles of the Lord of hosts: but if this trumpet gives an uncertain sound, as it does when grace and works are blended together in the business of salvation; and faith or works put in the room of, or joined with the righteousness of Christ in justification; when particular election and general redemption, or the salvability of all men, are put together; the covenant of grace represented as conditional, and preparations for grace, and offers of grace, and days of grace talked of, that may be past and lost; then who can prepare himself for the battle? persons must be thrown into, and left in the utmost uncertainty and confusion: when this is the case, they know not what side to take on, but halt between two opinions; they know not what that faith is they are to fight and earnestly contend for; they are not able to discern an enemy from a friend; they have no heart to fight and endure hardness, as good soldiers of Christ; nor can they promise themselves, or be assured of victory, which the certain sound of the Gospel gives them.

(y) Vid Alex. ab Alex. Genial. Dier. l. 4. c. 2. p. 178.

The trumpet (σάλπιγξ)

Properly, a war-trumpet.

Sound (φωνὴν)

Rev., much better, voice, preserving the distinction between the mere sound of the trumpet and the modulated notes. The case might be illustrated by the bugle calls or points by which military commands are issued, as distinguished from the mere blare of the trumpet.

For if the trumpet give an uncertain sound, who shall prepare himself to the battle?

14:8 If the trumpet given an uncertain sound. The various distinctions of note sounded a charge, a retreat, etc.

14:8 Who will prepare himself for the battle - Unless he understand what the trumpet sounds? suppose a retreat or a march.

8. Translate, "For if also," an additional step in the argument.

uncertain sound-having no definite meaning: whereas it ought to be so marked that one succession of notes on the trumpet should summon the soldiers to attack; another, to retreat; another, to some other evolution.

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.