Jesus answered him, "Most assuredly, I tell you, unless one is born anew,{The word translated "anew" here and in John 3:7 (anothen) also means "again" and "from above".} he can't see the Kingdom of God."
The kingdom of God ...  It is a mistake to minimize the teaching of this Gospel regarding the kingdom of God. True, John was more concerned with the credentials of the King, the burden of the Gospel being to prove the deity and Godhead of Jesus Christ; but the kingdom was never far from his thoughts.  In this great passage, the terms of entering the kingdom are emphatically stated; and before Pontius Pilate Jesus made pointed reference to "my kingdom" (John 18:36,37).  Jesus' great purpose of establishing his kingdom is there stated to have been his total reason for coming into the world; and John, with the synoptics, recorded the inscription with the significant words "The King of the Jews" (John 19:19).