John 3:12

If I have told you earthly things, and ye believe not, how will ye 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, Verily, verily, I say to thee, Except a man be born again, he cannot see the kingdom of God.

John 3:5

Jesus answered, Verily, verily, I say to thee, Except a man be born of water, and of the Spirit, he cannot enter into the kingdom of God.

John 3:8

The wind bloweth where it will, and thou hearest the sound of it, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.

John 3:13-17

And no man hath ascended to heaven, but he that came down from heaven, even the Son of man who is in heaven.

John 3:31-36

He that cometh from above is above all: he that is of the earth is earthly, and speaketh of the earth: he that cometh from heaven is above all.

1 Corinthians 2:7-9

But we speak the wisdom of God in a mystery, even the hidden wisdom which God ordained before the world to our glory:

1 Corinthians 3:1-2

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

1 Timothy 3:16

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

Hebrews 5:11

Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.

1 Peter 2:1-3

Wherefore, laying aside all malice, and all guile, 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 to be the 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, Verily, verily, I say to thee, Except a man be born again, he cannot see the kingdom of God.
1 Corinthians 3:1
And I, brethren, could not speak to you as to spiritual, but as to carnal, even as to babes in Christ.
Hebrews 5:11
Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
1 Peter 2:1
Wherefore, laying aside all malice, and all guile, and hypocrisies, and envies, and all evil-speakings,

Heavenly

John 3:13
And no man hath ascended to heaven, but he that came down from heaven, even 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, even the hidden wisdom which God ordained before the world to our glory:
1 Timothy 3:16
And without controversy, great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen by angels, preached to the Gentiles, believed on in the world, 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 for our sins.