John 3:12

If I have told you earthly things and you believe not, how will you believe if I should 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, I tell you most truly, unless one has been born again he cannot see the kingdom of God.

John 3:5

Jesus answered, I tell you most truly, unless a man is born of water and of the Spirit, he cannot enter into the kingdom of God.

John 3:8

The Spirit breathes where it wills, and you hear its voice, but you know not whence it comes, nor whither it goes; so is every one that has been born of the Spirit.

John 3:13-17

And no one has ascended into heaven but he that came down from heaven, the Son of man who is in heaven.

John 3:31-36

He that comes from above is above all; he that is of the earth is of the earth, and speaks of the earth. He that comes from heaven is above all;

1 Corinthians 2:7-9

but we speak a wisdom of God hid in mystery, which God appointed from eternity for our glory,

1 Corinthians 3:1-2

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

1 Timothy 3:16

And confessedly great is the mystery of piety; [Christ,] who was manifested in the flesh, was justified in the spirit, was seen by angels, was preached to the nations, was believed on in the world, was received up into glory.

Hebrews 5:11

Concerning whom we have much to say, and that which is difficult to explain, because you have become dull of hearing.

1 Peter 2:1-3

Laying aside therefore all malice and all deceit and hypocrisies and envies 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 a propitiation 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 and said to him, I tell you most truly, unless one has been born again he cannot see the kingdom of God.
1 Corinthians 3:1
And I, brothers, was not able to speak to you as spiritual, but as carnal, as babes in Christ.
Hebrews 5:11
Concerning whom we have much to say, and that which is difficult to explain, because you have become dull of hearing.
1 Peter 2:1
Laying aside therefore all malice and all deceit and hypocrisies and envies and all evil speakings,

Heavenly

John 3:13
And no one has ascended into heaven but he that 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 a wisdom of God hid in mystery, which God appointed from eternity for our glory,
1 Timothy 3:16
And confessedly great is the mystery of piety; [Christ,] who was manifested in the flesh, was justified in the spirit, was seen by angels, was preached to the nations, was believed on in the world, was 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 a propitiation for our sins.