Jesus answered and said to him, “Most assuredly, I say to you, unless one is born again, he cannot see the kingdom of God.”
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?”
Jesus answered, “Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.” (John 3:3-5)
The kingdom of God makes all things new. Because King Jesus makes all things new. “Then He who sat on the throne said, ‘Behold, I make all things new’” (Revelation 21:5).
So, all who want to be a part of Jesus’ kingdom must be made new, too. This came as quite a shock for Nicodemus and the religious establishment of Jesus’ day.
Still does today.