15 So what's the solution? The answer is simple enough. Do both. I should be spiritually free and expressive as I pray, but I should also be thoughtful and mindful as I pray. I should sing with my spirit, and sing with my mind. 16 If you give a blessing using your private prayer language, which no one else understands, how can some outsider who has just shown up and has no idea what's going on know when to say "Amen"? 17 Your blessing might be beautiful, but you have very effectively cut that person out of it. 18 I'm grateful to God for the gift of praying in tongues that he gives us for praising him, which leads to wonderful intimacies we enjoy with him. I enter into this as much or more than any of you. 19 But when I'm in a church assembled for worship, I'd rather say five words that everyone can understand and learn from than say ten thousand that sound to others like gibberish. 20 To be perfectly frank, I'm getting exasperated with your infantile thinking. How long before you grow up and use your head - your adult head? It's all right to have a childlike unfamiliarity with evil; a simple no is all that's needed there. But there's far more to saying yes to something. Only mature and well-exercised intelligence can save you from falling into gullibility.
21 It's written in Scripture that God said, In strange tongues and from the mouths of strangers I will preach to this people, but they'll neither listen nor believe. 22 So where does it get you, all this speaking in tongues no one understands? It doesn't help believers, and it only gives unbelievers something to gawk at. Plain truth-speaking, on the other hand, goes straight to the heart of believers and doesn't get in the way of unbelievers. 23 If you come together as a congregation and some unbelieving outsiders walk in on you as you're all praying in tongues, unintelligible to each other and to them, won't they assume you've taken leave of your senses and get out of there as fast as they can? 24 But if some unbelieving outsiders walk in on a service where people are speaking out God's truth, the plain words will bring them up against the truth 25 and probe their hearts. Before you know it, they're going to be on their faces before God, recognizing that God is among you.
Matthew Henry's Commentary on 1 Corinthians 14:15-25
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.