We believe heavenly things for we have been born of water and of the Spirit. Jesus explained those heavenly things to Nicodemus and to us.
1 Now there was a man of the Pharisees named Nicodemus, a ruler of the Judeans. 2 He came to Yeshua by night and said to him, “Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do, unless God is with him.”
3 Yeshua answered him, “Most certainly I tell you, unless one is born anew, he can’t see God’s Kingdom.”
4 Nicodemus said to him, “How can a man be born when he is old? Can he enter a second time into his mother’s womb and be born?”
5 Yeshua answered, “Most certainly I tell you, unless one is born of water and Spirit, he can’t enter into God’s Kingdom. 6 That which is born of the flesh is flesh. That which is born of the Spirit is spirit. 7 Don’t marvel that I said to you, ‘You must be born anew.’ 8 The wind† blows where it wants to, and you hear its sound, but don’t know where it comes from and where it is going. So is everyone who is born of the Spirit.”
9 Nicodemus answered him, “How can these things be?”
10 Yeshua answered him, “Are you the teacher of Israel, and don’t understand these things? 11 Most certainly I tell you, we speak that which we know and testify of that which we have seen, and you don’t receive our witness. 12 If I told you earthly things and you don’t believe, how will you believe if I tell you heavenly things? 13 No one has ascended into heaven but he who descended out of heaven, the Son of Man, who is in heaven. 14 As Moses lifted up the serpent in the wilderness, even so must the Son of Man be lifted up, 15 that whoever believes in him should not perish, but have eternal life. 16 For God so loved the world, that he gave his only born‡ Son, that whoever believes in him should not perish, but have eternal life. 17 For God didn’t send his Son into the world to judge the world, but that the world should be saved through him. 18 He who believes in him is not judged. He who doesn’t believe has been judged already, because he has not believed in the name of the only born Son of God. 19 This is the judgment, that the light has come into the world, and men loved the darkness rather than the light, for their works were evil. 20 For everyone who does evil hates the light and doesn’t come to the light, lest his works would be exposed. 21 But he who does the truth comes to the light, that his works may be revealed, that they have been done in God.” John 3:1-21
That’s a lot to take in. Nicodemus couldn’t get past the born of the spirit part.
Nicodemus had objected to the doctrine because he did not understand how it could be. Jesus shows him that he ought not to reject it on that account, for he constantly believed things quite as difficult. It might appear incomprehensible, but it was to be judged of by its effects. As in this case of the wind, the effects were seen, the sound was heard, important changes were produced by it, trees and clouds were moved, yet the wind is not seen, nor do we know whence it comes, nor by what laws it is governed; so it is with the operations of the Spirit. We see the changes produced. Men just now sinful become holy; the thoughtless become serious; the licentious become pure; the vicious, moral; the moral, religious; the prayerless, prayerful; the rebellious and obstinate, meek, and mild, and gentle. When we see such changes, we ought no more to doubt that they are produced by some cause – by some mighty agent, than when we see the trees moved, or the waters of the ocean piled on heaps, or feet the cooling effects of a summer’s breeze. In those cases we attribute it to the “wind,” though we see it not, and though we do not understand its operations. Barnes
Believing heavenly things is a blessing from God our Father in heaven.
By God’s blessings, we believe heavenly things. Just as He planned, God blessed us with every spiritual blessing in the heavenly places in Christ (Eph 1:3) made us new creatures created Christ (Eph 2:10) born of water and the Spirit (Jn 3:6) as offspring of God (Acts 17:28-28). Thus, we believe heavenly things like born again and kingdom.
The moment we believed, we were regenerated (Titus 3:1-7). The word “regeneration” comes from Greek root words translated “again/pálin ” and “birth /genesis.” Jesus explains the washing of regeneration:
“Most certainly I tell you, unless one is born of water and Spirit, he can’t enter into God’s Kingdom.” John 3:5
Through the washing of regeneration we receive our spirit.
“That which is born of the flesh is flesh. That which is born of the Spirit is spirit.” John 3:6
” 23 May the God of peace himself sanctify you completely. May your whole spirit, soul, and body be preserved blameless at the coming of our Lord Yeshua the Messiah. 24 He who calls you is faithful, who will also do it. ” 1 Thessalonians 5 WMB
All Scripture quoted above is from the World Messianic Bible WMB