Jesus' discussion with Nicodemus is so loaded with meaning that I think we should discuss it here one more time. What does it mean to be born again? What does it mean to have eternal life? We start with Nicodemus statement because it is profound and true; "After dark one evening, he came to speak with Jesus. “Rabbi,” he said, “we all know that God has sent you to teach us. Your miraculous signs are evidence that God is with you.”
John 3:2 NLT. Nicodemus is saying that, the miraculous signs they saw Jesus doing was evidence that God is with you. Jesus does not disagree but adds that nature, who gave birth to us, is what determines what follows us and what we do. "Jesus replied, “I tell you the truth, unless you are born again, you cannot see the Kingdom of God.” Jesus replied, “I assure you, no one can enter the Kingdom of God without being born of water and the Spirit. Humans can reproduce only human life, but the Holy Spirit gives birth to spiritual life.
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John 3:3, 5-6 NLT. Nature is what determines what we have the capacity to do. In other words, Jesus himself was doing the things he was not just because he was sent by God, because God has sent many others before him, but because he was born by the Holy Spirit. Your nature puts a cap or limit on your ability. None of us wonders when we see a dog barks or a cat mews because it is in their nature. However, we would raise a highbrow if a dog was to start speaking like a human because we know it is not in a dog's nature to speak.
This singular truth is the reason we tell people that Christianity is not a religion, it is a change of nature. When you come to Jesus, he does not give you religion, no, Jesus changes your nature.
This was why John the baptists also testified about Jesus; "The Father loves the Son and has put everything into his hands. And anyone who believes in God's Son has eternal life. Anyone who doesn't obey the Son will never experience eternal life but remain under God's angry judgement." John 3:35-36. I say plainly once again; "No Jesus, no life". It is only by accepting Jesus that our nature changes, we become born again, we receive eternal life and are now children of God. Halleluyah!