1 Corinthians 14:16

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].

Therefore, if the whole church assembles together and everyone speaks in languages [i.e., supernaturally], and outsiders [i.e., people who do not understand the language being spoken] or unbelievers come [into the assembly], will they not say that you people are crazy?

Now the Jewish authorities were amazed, saying, "How can this man know so much, since he has never been educated?"

Now when these men saw how boldly Peter and John spoke, and perceived that they were uneducated and [even] ignorant men, they were quite surprised; then they recognized that they had been with Jesus.

I always thank God for you, [especially] for God's unearned favor that was given to you [in providing salvation and blessings] in Christ Jesus.