16 Since otherwise, if thou blessest with [the] spirit, how shall he who fills the place of the simple [Christian] say Amen, at thy giving of thanks, since he does not know what thou sayest? 17 For thou indeed givest thanks well, but the other is not edified. 18 I thank God I speak in a tongue more than all of you: 19 but in [the] assembly I desire to speak five words with my understanding, that I may instruct others also, [rather] than ten thousand words in a tongue. 20 Brethren, be not children in [your] minds, but in malice be babes; but in [your] minds be grown [men].
21 It is written in the law, By people of other tongues, and by strange lips, will I speak to this people; and neither thus will they hear me, saith the Lord. 22 So that tongues are for a sign, not to those who believe, but to unbelievers; but prophecy, not to unbelievers, but to those who believe. 23 If therefore the whole assembly come together in one place, and all speak with tongues, and simple [persons] enter in, or unbelievers, will not they say ye are mad? 24 But if all prophesy, and some unbeliever or simple [person] come in, he is convicted of all, he is judged of all; 25 the secrets of his heart are manifested; and thus, falling upon [his] face, he will do homage to God, reporting that God is indeed amongst you.
Matthew Henry's Commentary on 1 Corinthians 14:16-25
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.