John 3:12

If I spoke to you things upon the earth, and you do net believe, how will you believe, if I speak to you of things in heaven?

John 1:1-14

In the beginning was the Word, and the Word was with God, and the Word was God.

John 3:3

Jesus responded and said to him, Truly, truly, I say unto thee, unless any one may be born from above, he is not able to see the kingdom of God.

John 3:5

Jesus responded, Truly, truly, I say unto thee, Unless any one may be born of water and Spirit, he is not able to enter into the kingdom of the heavens.

John 3:8

The Spirit breathes on whom He willeth, and thou hearest His voice, but dost not know whence He cometh and whither He goeth; so is every one who has been born of the Spirit.

John 3:13-17

No one hath ascended up into heaven, but the one having come down from heaven, the Son of man, who is in heaven.

John 3:31-36

He that cometh from above is above all;

1 Corinthians 2:7-9

but we speak the wisdom of God having been hidden in a mystery, which God predestinated before the ages unto our glory:

1 Corinthians 3:1-2

And I, brethren, was not able to speak unto you as unto spiritual, but as unto carnal, even babes in Christ.

1 Timothy 3:16

And assuredly great is the mystery of godliness; Who is manifested in the flesh, was justified in the spirit, was seen of angels, was preached among the Gentiles, was believed on in the world, was taken up in glory.

Hebrews 5:11

Concerning whom there is much word to us, and difficult to speak, since you are dull of hearing.

1 Peter 2:1-3

Therefore having laid aside all evil, and all guile, and hypocrisies, and envyings, and all calumniations;

1 John 4:10

In him is divine love, not because we loved God with divine love, but because he loved us with divine love, and sent his Son an expiation for our sins.

Treasury of Scripture Knowledge

Summary

If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?

Bible References

Earthly

John 3:3
Jesus responded and said to him, Truly, truly, I say unto thee, unless any one may be born from above, he is not able to see the kingdom of God.
1 Corinthians 3:1
And I, brethren, was not able to speak unto you as unto spiritual, but as unto carnal, even babes in Christ.
Hebrews 5:11
Concerning whom there is much word to us, and difficult to speak, since you are dull of hearing.
1 Peter 2:1
Therefore having laid aside all evil, and all guile, and hypocrisies, and envyings, and all calumniations;

Heavenly

John 3:13
No one hath ascended up into heaven, but the one having come down from heaven, the Son of man, who is in heaven.
John 1:1
In the beginning was the Word, and the Word was with God, and the Word was God.
1 Corinthians 2:7
but we speak the wisdom of God having been hidden in a mystery, which God predestinated before the ages unto our glory:
1 Timothy 3:16
And assuredly great is the mystery of godliness; Who is manifested in the flesh, was justified in the spirit, was seen of angels, was preached among the Gentiles, was believed on in the world, was taken up in glory.
1 John 4:10
In him is divine love, not because we loved God with divine love, but because he loved us with divine love, and sent his Son an expiation for our sins.