9 It's the same for you. If you speak to people in words they don't understand, how will they know what you are saying? You might as well be talking into empty space. 10 There are many different languages in the world, and every language has meaning. 11 But if I don't understand a language, I will be a foreigner to someone who speaks it, and the one who speaks it will be a foreigner to me. 12 And the same is true for you. Since you are so eager to have the special abilities the Spirit gives, seek those that will strengthen the whole church. 13 So anyone who speaks in tongues should pray also for the ability to interpret what has been said. 14 For if I pray in tongues, my spirit is praying, but I don't understand what I am saying.
15 Well then, what shall I do? I will pray in the spirit, and I will also pray in words I understand. I will sing in the spirit, and I will also sing in words I understand. 16 For if you praise God only in the spirit, how can those who don't understand you praise God along with you? How can they join you in giving thanks when they don't understand what you are saying? 17 You will be giving thanks very well, but it won't strengthen the people who hear you. 18 I thank God that I speak in tongues more than any of you. 19 But in a church meeting I would rather speak five understandable words to help others than ten thousand words in an unknown language.
Matthew Henry's Commentary on 1 Corinthians 14:9-19
Commentary on 1 Corinthians 14:6-14
(Read 1 Corinthians 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.
Commentary on 1 Corinthians 14:15-25
(Read 1 Corinthians 14:15-25)
There can be no assent to prayers that are not understood. A truly Christian minister will seek much more to do spiritual good to men's souls, than to get the greatest applause to himself. This is proving himself the servant of Christ. Children are apt to be struck with novelty; but do not act like them. Christians should be like children, void of guile and malice; yet they should not be unskilful as to the word of righteousness, but only as to the arts of mischief. It is a proof that a people are forsaken of God, when he gives them up to the rule of those who teach them to worship in another language. They can never be benefitted by such teaching. Yet thus the preachers did who delivered their instructions in an unknown tongue. Would it not make Christianity ridiculous to a heathen, to hear the ministers pray or preach in a language which neither he nor the assembly understood? But if those who minister, plainly interpret Scripture, or preach the great truths and rules of the gospel, a heathen or unlearned person might become a convert to Christianity. His conscience might be touched, the secrets of his heart might be revealed to him, and so he might be brought to confess his guilt, and to own that God was present in the assembly. Scripture truth, plainly and duly taught, has a wonderful power to awaken the conscience and touch the heart.