John 3:12

If you do not believe the earthly things I tell you, how can you believe the heavenly things, if I tell you about them?

John 1:1-14

In the beginning the Word existed; and the Word was face to face with God; yea, the Word was God Himself.

John 3:3

Jesus answered him, "I most solemnly say to you, no one can ever see the kingdom of God, unless he is born from above."

John 3:5

Jesus answered, "I most solemnly say to you, no one can ever get into the kingdom of God, unless he is born of water and the Spirit.

John 3:8

The wind blows where it pleases, and you hear the sound of it, but you do not know where it comes from or where it goes. That is just the way it is with everyone who is born of the Spirit."

John 3:13-17

And yet no one has gone up into heaven except the Son of Man who came down out of heaven.

John 3:31-36

He who comes from above is far above all others. He who springs from earth belongs to the earth and speaks of earth. He who comes from heaven is far above all others.

1 Corinthians 2:7-9

rather, we are setting forth a wisdom that came from God, once a covered secret but now uncovered, which God marked off as His plan for bringing us to glory.

1 Corinthians 3:1-2

So I myself, brothers, could not deal with you as spiritual persons, but as creatures of human clay, as merely baby Christians.

1 Timothy 3:16

Undoubtedly the mystery of our religion is a great wonder: "He was made visible in human form; He was vindicated by the Spirit; He was seen by angels; He was proclaimed among the heathen; He was trusted in throughout the world; He was taken up to glory."

Hebrews 5:11

I have much to say to you about Him, but it is difficult to make it clear to you, since you have become so dull in your spiritual senses.

1 Peter 2:1-3

So once for all get rid of all malice, deceit, hypocrisy, envy, and all sorts of slander,

1 John 4:10

In this way is seen the true love, not that we loved God but that He loved us and sent His Son to be the atoning sacrifice 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 answered him, "I most solemnly say to you, no one can ever see the kingdom of God, unless he is born from above."
1 Corinthians 3:1
So I myself, brothers, could not deal with you as spiritual persons, but as creatures of human clay, as merely baby Christians.
Hebrews 5:11
I have much to say to you about Him, but it is difficult to make it clear to you, since you have become so dull in your spiritual senses.
1 Peter 2:1
So once for all get rid of all malice, deceit, hypocrisy, envy, and all sorts of slander,

Heavenly

John 3:13
And yet no one has gone up into heaven except the Son of Man who came down out of heaven.
John 1:1
In the beginning the Word existed; and the Word was face to face with God; yea, the Word was God Himself.
1 Corinthians 2:7
rather, we are setting forth a wisdom that came from God, once a covered secret but now uncovered, which God marked off as His plan for bringing us to glory.
1 Timothy 3:16
Undoubtedly the mystery of our religion is a great wonder: "He was made visible in human form; He was vindicated by the Spirit; He was seen by angels; He was proclaimed among the heathen; He was trusted in throughout the world; He was taken up to glory."
1 John 4:10
In this way is seen the true love, not that we loved God but that He loved us and sent His Son to be the atoning sacrifice for our sins.