1 Corinthians 2:14

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.

1 Corinthians 1:18

For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.

Jude 1:19

These be they who separate themselves, sensual, having not the Spirit.

Matthew 13:11-17

He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.

1 Corinthians 15:44

It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.

Matthew 16:23

But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.

John 3:3-6

Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.

John 5:44

How can ye believe, which receive honour one of another, and seek not the honour that cometh from God only?

John 8:51-52

Verily, verily, I say unto you, If a man keep my saying, he shall never see death.

1 Corinthians 15:46

Howbeit that was not first which is spiritual, but that which is natural; and afterward that which is spiritual.

James 3:15

This wisdom descendeth not from above, but is earthly, sensual, devilish.

Proverbs 14:6

A scorner seeketh wisdom, and findeth it not: but knowledge is easy unto him that understandeth.

John 6:44-45

No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.

John 8:43

Why do ye not understand my speech? even because ye cannot hear my word.

John 10:20

And many of them said, He hath a devil, and is mad; why hear ye him?

John 10:26-27

But ye believe not, because ye are not of my sheep, as I said unto you.

John 12:37

But though he had done so many miracles before them, yet they believed not on him:

John 14:26

But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.

John 15:26

But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:

John 16:8-15

And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:

Acts 16:14

And a certain woman named Lydia, a seller of purple, of the city of Thyatira, which worshipped God, heard us: whose heart the Lord opened, that she attended unto the things which were spoken of Paul.

Acts 17:18

Then certain philosophers of the Epicureans, and of the Stoicks, encountered him. And some said, What will this babbler say? other some, He seemeth to be a setter forth of strange gods: because he preached unto them Jesus, and the resurrection.

Acts 17:32

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

Acts 18:15

But if it be a question of words and names, and of your law, look ye to it; for I will be no judge of such matters.

Acts 25:19

But had certain questions against him of their own superstition, and of one Jesus, which was dead, whom Paul affirmed to be alive.

Acts 26:24-25

And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad.

Romans 8:5-8

For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.

1 Corinthians 1:23

But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;

1 Corinthians 2:12

Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.

2 Corinthians 4:4-6

In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.

1 John 2:20

But ye have an unction from the Holy One, and ye know all things.

1 John 2:27

But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him.

1 John 5:20

And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This 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
He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.
Matthew 16:23
But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.
John 3:3
Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
John 8:43
Why do ye not understand my speech? even because ye cannot hear my word.
John 10:26
But ye believe not, because ye are not of my sheep, as I said unto you.
John 12:37
But though he had done so many miracles before them, yet they believed not on him:
Romans 8:5
For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.

The things

1 Corinthians 2:12
Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.
John 14:26
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
John 15:26
But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
John 16:8
And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:

They

1 Corinthians 1:18
For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
John 8:51
Verily, verily, I say unto you, If a man keep my saying, he shall never see death.
John 10:20
And many of them said, He hath a devil, and is mad; why hear ye him?
Acts 17:18
Then certain philosophers of the Epicureans, and of the Stoicks, encountered him. And some said, What will this babbler say? other some, He seemeth to be a setter forth of strange gods: because he preached unto them Jesus, and the resurrection.
Acts 18:15
But if it be a question of words and names, and of your law, look ye to it; for I will be no judge of such matters.
Acts 25:19
But had certain questions against him of their own superstition, and of one Jesus, which was dead, whom Paul affirmed to be alive.
Acts 26:24
And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad.

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 the LORD understand all things.
Luke 7:23
And blessed is he, whosoever shall not be offended in me.
John 1:5
And the light shineth in darkness; and the darkness comprehended it not.

King James Version Public Domain