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.
23. whole … all … tongues—The more there are assembled, and the more that speak in unknown tongues, the more will the impression be conveyed to strangers "coming in" from curiosity ("unbelievers"), or even from a better motive ("unlearned"), that the whole body of worshippers is a mob of fanatical "madmen"; and that "the Church is like the company of builders of Babel after the confusion of tongues, or like the cause tried between two deaf men before a deaf judge, celebrated in the Greek epigram" [Grotius].
unlearned—having some degree of faith, but not gifts [Bengel].