Who believes – and who disbelieves – this is what…

Who believes – and who disbelieves – this is what was meant when Jesus said, “You MUST be born again?”
John 3:3-7 Jesus answered and said to him, “Most assuredly, I say to you, >>>unless one is born again, he cannot SEE the kingdom of God.”<<>>“How can a man be born when he is old? Can he enter a second time into his mother’s womb and be born?”<<>>he cannot ENTER the kingdom of God.<<<
6 That which is born of the flesh [the first time one is "naturally" born when the mother's water breaks] is flesh, and that which is born of the Spirit is spirit.
7 Do not marvel that I said to you, ‘You MUST be born again.’
Please use Scripture to validate your opinion if you disbelieve the above.