1 Corinthians 2:14

But the natural man does not receive the things of the Spirit of God, for they are folly to him; and he cannot know them because they are spiritually discerned;

1 Corinthians 1:18

For the word of the cross is to them that perish foolishness, but to us that are saved it is God's power.

Jude 1:19

These are they who set themselves apart, natural men, not having the Spirit.

Matthew 13:11-17

And he answering said to them, Because to you it is given to know the mysteries of the kingdom of the heavens, but to them it is not given;

1 Corinthians 15:44

It is sown a natural body, it is raised a spiritual body: if there is a natural body, there is also a spiritual one.

Matthew 16:23

But turning round, he said to Peter, Get away behind me, Satan; thou art an offence to me, for thy mind is not on the things that are of God, but on the things that are of men.

John 3:3-6

Jesus answered and said to him, Verily, verily, I say unto thee, Except any one be born anew he cannot see the kingdom of God.

John 5:44

How can ye believe, who receive glory one of another, and seek not the glory which comes from God alone?

John 8:51-52

Verily, verily, I say unto you, If any one shall keep my word, he shall never see death.

1 Corinthians 15:46

But that which is spiritual was not first, but that which is natural, then that which is spiritual:

James 3:15

This is not the wisdom which comes down from above, but earthly, natural, devilish.

Proverbs 14:6

A scorner seeketh wisdom, and there is none for him; but knowledge is easy unto the intelligent.

John 6:44-45

No one can come to me except the Father who has sent me draw him, and I will raise him up in the last day.

John 8:43

Why do ye not know my speech? Because ye cannot hear my word.

John 10:20

but many of them said, He has a demon and raves; why do ye hear him?

John 10:26-27

but ye do not believe, for ye are not of my sheep, as I told you.

John 12:37

But though he had done so many signs before them, they believed not on him,

John 14:26

but the Comforter, the Holy Spirit, whom the Father will send in my name, he shall teach you all things, and will bring to your remembrance all the things which I have said to you.

John 15:26

But when the Comforter is come, whom I will send to you from the Father, the Spirit of truth who goes forth from with the Father, he shall bear witness concerning me;

John 16:8-15

And having come, he will bring demonstration to the world, of sin, and of righteousness, and of judgment:

Acts 16:14

And a certain woman, by name Lydia, a seller of purple, of the city of Thyatira, who worshipped God, heard; whose heart the Lord opened to attend to the things spoken by Paul.

Acts 17:18

But some also of the Epicurean and Stoic philosophers attacked him. And some said, What would this chatterer say? and some, He seems to be an announcer of foreign demons, because he announced the glad tidings of Jesus and the resurrection to them.

Acts 17:32

And when they heard of the resurrection of the dead, some mocked, and some said, We will hear thee again also concerning this.

Acts 18:15

but if it be questions about words, and names, and the law that ye have, see to it yourselves; for I do not intend to be judge of these things.

Acts 25:19

but had against him certain questions of their own system of worship, and concerning a certain Jesus who is dead, whom Paul affirmed to be living.

Acts 26:24-25

And as he answered for his defence with these things, Festus says with a loud voice, Thou art mad, Paul; much learning turns thee to madness.

Romans 8:5-8

For they that are according to flesh mind the things of the flesh; and they that are according to Spirit, the things of the Spirit.

1 Corinthians 1:23

but we preach Christ crucified, to Jews an offence, and to nations foolishness;

1 Corinthians 2:12

But we have received, not the spirit of the world, but the Spirit which is of God, that we may know the things which have been freely given to us of God:

2 Corinthians 4:4-6

in whom the god of this world has blinded the thoughts of the unbelieving, so that the radiancy of the glad tidings of the glory of the Christ, who is the image of God, should not shine forth for them.

1 John 2:20

And ye have the unction from the holy one, and ye know all things.

1 John 2:27

and yourselves, the unction which ye have received from him abides in you, and ye have not need that any one should teach you; but as the same unction teaches you as to all things, and is true and is not a lie, and even as it has taught you, ye shall abide in him.

1 John 5:20

And we know that the Son of God has come, and has given us an understanding that we should know him that is true; and we are in him that is true, in his Son Jesus Christ. He is the true God and eternal life.

Treasury of Scripture Knowledge

Summary

But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.

Bible References

Receiveth

Matthew 13:11
And he answering said to them, Because to you it is given to know the mysteries of the kingdom of the heavens, but to them it is not given;
Matthew 16:23
But turning round, he said to Peter, Get away behind me, Satan; thou art an offence to me, for thy mind is not on the things that are of God, but on the things that are of men.
John 3:3
Jesus answered and said to him, Verily, verily, I say unto thee, Except any one be born anew he cannot see the kingdom of God.
John 8:43
Why do ye not know my speech? Because ye cannot hear my word.
John 10:26
but ye do not believe, for ye are not of my sheep, as I told you.
John 12:37
But though he had done so many signs before them, they believed not on him,
Romans 8:5
For they that are according to flesh mind the things of the flesh; and they that are according to Spirit, the things of the Spirit.

The things

1 Corinthians 2:12
But we have received, not the spirit of the world, but the Spirit which is of God, that we may know the things which have been freely given to us of God:
John 14:26
but the Comforter, the Holy Spirit, whom the Father will send in my name, he shall teach you all things, and will bring to your remembrance all the things which I have said to you.
John 15:26
But when the Comforter is come, whom I will send to you from the Father, the Spirit of truth who goes forth from with the Father, he shall bear witness concerning me;
John 16:8
And having come, he will bring demonstration to the world, of sin, and of righteousness, and of judgment:

They

1 Corinthians 1:18
For the word of the cross is to them that perish foolishness, but to us that are saved it is God's power.
John 8:51
Verily, verily, I say unto you, If any one shall keep my word, he shall never see death.
John 10:20
but many of them said, He has a demon and raves; why do ye hear him?
Acts 17:18
But some also of the Epicurean and Stoic philosophers attacked him. And some said, What would this chatterer say? and some, He seems to be an announcer of foreign demons, because he announced the glad tidings of Jesus and the resurrection to them.
Acts 18:15
but if it be questions about words, and names, and the law that ye have, see to it yourselves; for I do not intend to be judge of these things.
Acts 25:19
but had against him certain questions of their own system of worship, and concerning a certain Jesus who is dead, whom Paul affirmed to be living.
Acts 26:24
And as he answered for his defence with these things, Festus says with a loud voice, Thou art mad, Paul; much learning turns thee to madness.

General references

Proverbs 8:9
They are all plain to him that understandeth, and right to them that find knowledge.
Proverbs 28:5
Evil men understand not judgment; but they that seek Jehovah understand everything.
Luke 7:23
and blessed is whosoever shall not be offended in me.
John 1:5
And the light appears in darkness, and the darkness apprehended it not.