1 Corinthians 14:2

For one who speaks in a tongue does not speak to men but to God; for no one understands, but in his spirit he speaks mysteries.

1 Corinthians 13:2

If I have the gift of prophecy, and know all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but do not have love, I am nothing.

Mark 16:17

These signs will accompany those who have believed: in My name they will cast out demons, they will speak with new tongues;

Acts 10:46

For they were hearing them speaking with tongues and exalting God. Then Peter answered,

Acts 19:6

And when Paul had laid his hands upon them, the Holy Spirit came on them, and they began speaking with tongues and prophesying.

Genesis 11:7

Come, let Us go down and there confuse their language, so that they will not understand one another’s speech.”

Genesis 42:23

They did not know, however, that Joseph understood, for there was an interpreter between them.

Deuteronomy 28:49

The Lord will bring a nation against you from afar, from the end of the earth, as the eagle swoops down, a nation whose language you shall not understand,

Psalm 49:3-4

My mouth will speak wisdom,
And the meditation of my heart will be understanding.

Psalm 78:2

I will open my mouth in a parable;
I will utter dark sayings of old,

Matthew 13:11

Jesus answered them, To you it has been granted to know the mysteries of the kingdom of heaven, but to them it has not been granted.

Mark 4:11

And He was saying to them, “To you has been given the mystery of the kingdom of God, but those who are outside get everything in parables,

Acts 2:4-11

And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit was giving them utterance.

Acts 22:9

And those who were with me saw the light, to be sure, but did not understand the voice of the One who was speaking to me.

Romans 16:25

Now to Him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which has been kept secret for long ages past,

1 Corinthians 2:7

but we speak God’s wisdom in a mystery, the hidden wisdom which God predestined before the ages to our glory;

1 Corinthians 2:10

For to us God revealed them through the Spirit; for the Spirit searches all things, even the depths of God.

1 Corinthians 14:9-11

So also you, unless you utter by the tongue speech that is clear, how will it be known what is spoken? For you will be speaking into the air.

1 Corinthians 14:16

Otherwise if you bless in the spirit only, how will the one who fills the place of the ungifted say the “Amen” at your giving of thanks, since he does not know what you are saying?

1 Corinthians 14:18-23

I thank God, I speak in tongues more than you all;

1 Corinthians 14:27-28

If anyone speaks in a tongue, it should be by two or at the most three, and each in turn, and one must interpret;

1 Corinthians 15:51

Behold, I tell you a mystery; we will not all sleep, but we will all be changed,

Ephesians 3:3-9

that by revelation there was made known to me the mystery, as I wrote before in brief.

Ephesians 6:19

and pray on my behalf, that utterance may be given to me in the opening of my mouth, to make known with boldness the mystery of the gospel,

Colossians 1:26-27

that is, the mystery which has been hidden from the past ages and generations, but has now been manifested to His saints,

Colossians 2:2

that their hearts may be encouraged, having been knit together in love, and attaining to all the wealth that comes from the full assurance of understanding, resulting in a true knowledge of God’s mystery, that is, Christ Himself,

1 Timothy 3:9

but holding to the mystery of the faith with a clear conscience.

1 Timothy 3:16

By common confession, great is the mystery of godliness:
He who was revealed in the flesh,
Was vindicated in the Spirit,
Seen by angels,
Proclaimed among the nations,
Believed on in the world,
Taken up in glory.

Revelation 10:7

but in the days of the voice of the seventh angel, when he is about to sound, then the mystery of God is finished, as He preached to His servants the prophets.

2 Kings 18:26

Then Eliakim the son of Hilkiah, and Shebnah and Joah, said to Rabshakeh, “Speak now to your servants in Aramaic, for we understand it; and do not speak with us in Judean in the hearing of the people who are on the wall.”

Treasury of Scripture Knowledge

Summary

For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.

Understandeth

Bible References

He that

1 Corinthians 14:9
So also you, unless you utter by the tongue speech that is clear, how will it be known what is spoken? For you will be speaking into the air.
Genesis 11:7
Come, let Us go down and there confuse their language, so that they will not understand one another’s speech.”
Genesis 42:23
They did not know, however, that Joseph understood, for there was an interpreter between them.
Deuteronomy 28:49
The Lord will bring a nation against you from afar, from the end of the earth, as the eagle swoops down, a nation whose language you shall not understand,
2 Kings 18:26
Then Eliakim the son of Hilkiah, and Shebnah and Joah, said to Rabshakeh, “Speak now to your servants in Aramaic, for we understand it; and do not speak with us in Judean in the hearing of the people who are on the wall.”
Acts 2:4
And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit was giving them utterance.
Acts 10:46
For they were hearing them speaking with tongues and exalting God. Then Peter answered,
Acts 19:6
And when Paul had laid his hands upon them, the Holy Spirit came on them, and they began speaking with tongues and prophesying.

Understandeth

Acts 22:9
And those who were with me saw the light, to be sure, but did not understand the voice of the One who was speaking to me.

Howbeit

1 Corinthians 2:7
but we speak God’s wisdom in a mystery, the hidden wisdom which God predestined before the ages to our glory;
1 Corinthians 13:2
If I have the gift of prophecy, and know all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but do not have love, I am nothing.
1 Corinthians 15:51
Behold, I tell you a mystery; we will not all sleep, but we will all be changed,
Psalm 49:3
My mouth will speak wisdom,
And the meditation of my heart will be understanding.
Psalm 78:2
I will open my mouth in a parable;
I will utter dark sayings of old,
Matthew 13:11
Jesus answered them, To you it has been granted to know the mysteries of the kingdom of heaven, but to them it has not been granted.
Mark 4:11
And He was saying to them, “To you has been given the mystery of the kingdom of God, but those who are outside get everything in parables,
Romans 16:25
Now to Him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which has been kept secret for long ages past,
Ephesians 3:3
that by revelation there was made known to me the mystery, as I wrote before in brief.
Ephesians 6:19
and pray on my behalf, that utterance may be given to me in the opening of my mouth, to make known with boldness the mystery of the gospel,
Colossians 1:26
that is, the mystery which has been hidden from the past ages and generations, but has now been manifested to His saints,
Colossians 2:2
that their hearts may be encouraged, having been knit together in love, and attaining to all the wealth that comes from the full assurance of understanding, resulting in a true knowledge of God’s mystery, that is, Christ Himself,
1 Timothy 3:9
but holding to the mystery of the faith with a clear conscience.
Revelation 10:7
but in the days of the voice of the seventh angel, when he is about to sound, then the mystery of God is finished, as He preached to His servants the prophets.