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Nicodemus, believed Jesus as Rabbi, a teacher from God, doing miracles by God, etc. But, he did not believe what Jesus has told. Even now, Christians believe that Jesus Christ has died for the world, and has resurrected, but they do not believe what Jesus Christ told us for our salvation. So, both Nicodemus and Christians will not see heaven unless they are born again and they will not enter heaven unless they are born of water and the spirit.