John 3:12

If I told you earthly things [that is, things that happen right here on earth] and you do not believe, how will you believe and trust Me if I tell you heavenly things?

John 1:1-14

In the beginning [before all time] was the Word (Christ), and the Word was with God, and the Word was God Himself.

John 3:3

Jesus answered him, “I assure you and most solemnly say to you, unless a person is born again [reborn from above—spiritually transformed, renewed, sanctified], he cannot [ever] see and experience the kingdom of God.”

John 3:5

Jesus answered, “I assure you and most solemnly say to you, unless one is born of water and the Spirit he cannot [ever] enter the kingdom of God.

John 3:8

The wind blows where it wishes and you hear its sound, but you do not know where it is coming from and where it is going; so it is with everyone who is born of the Spirit.”

John 3:13-17

No one has gone up into heaven, but there is One who came down from heaven, the Son of Man [Himself—whose home is in heaven].

John 3:31-36

“He who comes from [heaven] above is above all others; he who is of the earth is from the earth and speaks [about things] of the earth [his viewpoint and experience are earthly]. He who comes from heaven is above all.

1 Corinthians 2:7-9

but we speak God’s wisdom in a mystery, the wisdom once hidden [from man, but now revealed to us by God, that wisdom] which God predestined before the ages to our glory [to lift us into the glory of His presence].

1 Corinthians 3:1-2

However, brothers and sisters, I could not talk to you as to spiritual people, but [only] as to worldly people [dominated by human nature], mere infants [in the new life] in Christ!

1 Timothy 3:16

And great, we confess, is the mystery [the hidden truth] of godliness:He (Jesus Christ) who was revealed in human flesh,
Was justified and vindicated in the Spirit,
Seen by angels,
Preached among the nations,
Believed on in the world,
Taken up in glory.

Hebrews 5:11

Concerning this we have much to say, and it is hard to explain, since you have become dull and sluggish in [your spiritual] hearing and disinclined to listen.

1 Peter 2:1-3

So put aside every trace of malice and all deceit and hypocrisy and envy and all slander and hateful speech;

1 John 4:10

In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation [that is, the atoning sacrifice, and the satisfying offering] for our sins [fulfilling God’s requirement for justice against sin and placating His wrath].

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 assure you and most solemnly say to you, unless a person is born again [reborn from above—spiritually transformed, renewed, sanctified], he cannot [ever] see and experience the kingdom of God.”
1 Corinthians 3:1
However, brothers and sisters, I could not talk to you as to spiritual people, but [only] as to worldly people [dominated by human nature], mere infants [in the new life] in Christ!
Hebrews 5:11
Concerning this we have much to say, and it is hard to explain, since you have become dull and sluggish in [your spiritual] hearing and disinclined to listen.
1 Peter 2:1
So put aside every trace of malice and all deceit and hypocrisy and envy and all slander and hateful speech;

Heavenly

John 3:13
No one has gone up into heaven, but there is One who came down from heaven, the Son of Man [Himself—whose home is in heaven].
John 1:1
In the beginning [before all time] was the Word (Christ), and the Word was with God, and the Word was God Himself.
1 Corinthians 2:7
but we speak God’s wisdom in a mystery, the wisdom once hidden [from man, but now revealed to us by God, that wisdom] which God predestined before the ages to our glory [to lift us into the glory of His presence].
1 Timothy 3:16
And great, we confess, is the mystery [the hidden truth] of godliness:He (Jesus Christ) who was revealed in human flesh,
Was justified and vindicated in the Spirit,
Seen by angels,
Preached among the nations,
Believed on in the world,
Taken up in glory.
1 John 4:10
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation [that is, the atoning sacrifice, and the satisfying offering] for our sins [fulfilling God’s requirement for justice against sin and placating His wrath].