1 Corinthians 14:14-17

Verse 14

For if I pray in an unknown tongue - If my prayers are composed of sentences and sayings taken out of the prophets, etc., and in their own language - my spirit prayeth, my heart is engaged in the work, and my prayers answer all the purpose of prayers to myself; but my understanding is unfruitful to all others, because they do not understand my prayers, and I either do not or cannot interpret them. See the note on 1Cor 14:19.
Verse 16

He that occupieth the room of the unlearned - One who is not acquainted with the language in which you speak, sing, or pray.

Say Amen - Give his assent and ratification to what he does not understand. It was very frequent in primitive times to express their approbation in the public assemblies by Amen. This practice, soberly and piously conducted, might still be of great use in the Church of Christ.

This response was of the highest authority and merit among the Jews; they even promised the remission of all sins, the annihilation of the sentence of damnation, and the opening of the gates of paradise, to those who fervently say Amen. And it is one of their maxims that "greater is he who says Amen than he who prays." See many testimonies of this kind in Schoettgen. Now, allowing that this was of so much consequence in the time of St. Paul, it was a very serious matter for a person to be in a congregation where prayer was offered, who could not say Amen, because the prayers were in a language which he did not understand.
Verse 17

Thou verily givest thanks well - Because he felt gratitude, and, from a sense of his obligation, gave praise to God; but because this was in an unknown tongue, those who heard him received no edification.
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