Let us not forget Enoch Gen 5:24 Heb 11:5 and Elijah 2 Kings 2:11 all went somewhere and did not die! We also know of Paul having an experience 2Cor 12:2 of being caught up to the third heaven....Jesus said John 14:3 "... I GO and PREPARE A PLACE FOR YOU, I will come again, and receive you unto myself that where I am, there ye may be also ". Jesus is coming again soon and He will takes His saints, that are alive in the flesh, to be with Him. Already the Heavens are filled with His saints who have died, but their flesh sleeps in the ground. This then is the resurrection, that when Christ comes, the dead are reunited with their bodies 1 Thess 4:16 . One cannot see this Kingdom unless they first repent of their sins or born again John 3:3 and you cannot enter into His Kingdom, unless you are baptized, and receive the Holy Spirit.... 1 John 3:5

I think it means we cannot ascend up to heaven. We have to allow Heaven to come down through us. To be Jesus, to live in total Love and share exactly that! Which will then connect us all as Men, ascending Man. Also, I 'd like to point out it says "even the Son of Man " Jesus is the Son of God. That 's what we need to be to return to heaven. The Son of God only Knows Love and is of one consciousness, not seeing other, only brother, which in turns binds the two through Love. So to return to Heaven, be the Son of God not the Son of Man who is Jesus, do as He did give only Love. Amen.

Jesus is telling Nicodemus that being born again is not a new teaching. It is there in the scriptures which he should have known. He is explaining what it means to believe in Jesus. The faith of Jesus includes a renewal of obedience to the commandments. Jesus quotes the scriptures in Deuteronomy 30:11-14: "For this commandment which I command you today is not too mysterious for you, nor is it far off. It is not in heaven, that you should say, 'Who will ascend into heaven for us and bring it to us, that we may hear it and do it? ' Nor is it beyond the sea, that you should say, 'Who will go over the sea for us and bring it to us, that we may hear it and do it. ' But the word is very near to you, in your mouth and in your heart, that you may do it. " Paul quotes this same passage in Romans 10:6-8: 6 But the righteousness that comes from faith talks like this: Don 't say in your heart, "Who will go up into heaven? " that is, to bring Christ down 7 or "Who will go down into the region below? " that is, to bring Christ up from the dead . 8 But what does it say? The word is near you, in your mouth and in your heart that is, the message of faith that we preach . This is evidence that instead of rabbinical law rituals of purity like hand washings and circumcision , Jesus taught a renewal and rebirth of God 's law which is His commandments also summed up in the law of love.

It means that, before one can physically ascend to heaven one should have had a physical descend from heaven. Adding that even Jesus Christ . So this implies that all men born of women dies just as men die but of those eg Angels do Descend and as well ascend.

the Son of Man(Jesus Christ) was the only one who ascended to Heaven,after His earthly ministry,and of course he ascended because he first came down from heaven during his birth.when he was born by the Holy Spirit of God..(Acts 1:9-11;3:15-21;Heb. 1:3;8:1; Psalm 110:1,2)

Since we know that Jesus came from heaven, He alone can speak with absolute authority and certainty on all matters about God, Heaven, our purpose and so on. He should know, He came from heaven. All other religions, though claiming divine inspiration, are simply speculation and wishful thinking based on obseving nature and best guesses.