John 3:12

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

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 answered and said to him, Truly, truly, I say to you, Unless a man is born again, he cannot see the kingdom of God.

John 3:5

Jesus answered, Truly, truly, I say to you, Unless a man is born of water and the Spirit, he cannot enter into the kingdom of God.

John 3:8

The Spirit breathes where He desires, and you hear His voice, but you do not know from where He comes, and where He goes; so is everyone who is born of the Spirit.

John 3:13-17

And no one has ascended up to Heaven except He who came down from Heaven, the Son of Man who is in Heaven.

John 3:31-36

He who comes from above is above all; he who is from the earth is earthly and speaks from the earth. He who comes from Heaven is above all,

1 Corinthians 2:7-9

But we speak the wisdom of God in a mystery, which God has hidden, predetermining it before the world for our glory;

1 Corinthians 3:1-2

And I, brothers, could not speak to you as to spiritual ones, but as to fleshly, as to babes in Christ.

1 Timothy 3:16

And without controversy great is the mystery of godliness: God was manifested in the flesh, justified in the Spirit, seen by angels, preached among nations, believed on in the world, and received up into glory.

Hebrews 5:11

of whom we have much to say, and hard to be explained since you are dull of hearing.

1 Peter 2:1-3

Therefore laying aside all malice and all guile and hypocrisies and envyings, and all evil speakings,

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 concerning 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 and said to him, Truly, truly, I say to you, Unless a man is born again, he cannot see the kingdom of God.
1 Corinthians 3:1
And I, brothers, could not speak to you as to spiritual ones, but as to fleshly, as to babes in Christ.
Hebrews 5:11
of whom we have much to say, and hard to be explained since you are dull of hearing.
1 Peter 2:1
Therefore laying aside all malice and all guile and hypocrisies and envyings, and all evil speakings,

Heavenly

John 3:13
And no one has ascended up to Heaven except He who came 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 in a mystery, which God has hidden, predetermining it before the world for our glory;
1 Timothy 3:16
And without controversy great is the mystery of godliness: God was manifested in the flesh, justified in the Spirit, seen by angels, preached among nations, believed on in the world, and received up into 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 concerning our sins.