(14) For if I pray in an unknown tongue.--Better, if I pray in a tongue. 1Corinthians 14:14-19 are expressed in the first person (except 1Corinthians 14:16-17, which are a parenthesis), as enforcing the Apostle's own example. A man praying in a tongue needed the gift of interpretation. The emotions of his spirit, kindled by the Spirit of God, found utterance in a "tongue," the gift of the Spirit of God; but his intellectual faculty grasped no definite idea, and could not, therefore, formulate it into human language; therefore the prayer which is offered merely in a tongue, from the spirit and not from the understanding, is useless as regards others. The Apostle is here speaking of public worship (see 1Corinthians 14:16), and not of private devotion; and the word "fruitless" implies the result, or rather the absence of result, as regards others.

Verse 14. - My understanding is unfruitful. I am only aware that I am praying. I have no definite consciousness as to what I say.

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.For if I pray in an unknown tongue,.... In the Hebrew tongue, which the greatest part of the Jewish doctors insisted (a) upon should be only used in prayer; which notion might be borrowed from them, and now greatly prevailed in the church at Corinth; and the custom was used by such as had the gift of speaking that language, even though the body and bulk of the people understood it not:

my spirit prayeth; I pray with my breath vocally; or else with affection and devotion, understanding what I say myself, and so am edified; or rather with the gift of the Spirit bestowed on me:

but my understanding is unfruitful; that is, what I say with understanding to myself is unprofitable to others, not being understood by them.

(a) Vid. Trigland. de Sect. Kar. c. 10. p. 172, 173.