So, unless you people also speak clearly with your tongue, how will your speaking be understood? For it will be like you were speaking into the air.

But now, brothers, if I come to you speaking in languages [supernaturally], how will I benefit you unless my speaking consists of a revelation [from God], or a [message of] knowledge [See 12:8], or a prophecy, or a teaching? [i.e., the message must be intelligible to be beneficial].

So, if I do not know the meaning of the sound [i.e., language], I will [appear] as a foreigner to the person speaking [that language to me]. And the person speaking [to me] will [appear] as a foreigner to me.

For the person who speaks in a language [supernaturally] does not speak to people, but to God, for no one can understand him [i.e., unless there is an interpreter or it is the person's native language]; he speaks [previously] unrevealed truths under the influence of the Holy Spirit [or "in his spirit"]. [Note: For a correct understanding of this chapter, it must be kept in mind that Paul is addressing a misuse ofthe gift of speaking in languages supernaturally. The Corinthians were doing this in the wrong way and for the wrong purpose].

But if there is no interpreter present [at the meeting], the person [i.e., with the ability to speak a language supernaturally] should remain quiet in the assembly. [Note: This implies that the speaker would know before he begins speaking whether or not an interpreter is present]. [In that case], he should speak [only] to himself and to God. [See verse 2].