Here is a cogent and brief article from D.A. Carson on the phrase “born of water and the Spirit” in John 3:5. Carson observes the text in light of Jesus’ argument to Nicodemus. He compares and contrasts the statement with another statement in the same discussion. He explains why some common interpretations don’t fit the context. And he explains the Old Testament imagery that Jesus draws on, and which Jesus expects Nicodemus to have understood.
The question is important, because it lies at the heart of Jesus’s explanation of “born again,” of new birth, of regeneration…
Many people think the question Nicodemus poses shows that he is a rather dimwitted literalist. But that’s almost certainly too harsh. You don’t get to be called “the teacher of Israel” (John 3:10—possibly a title) if you can’t spot the odd metaphor. When he hears Jesus say that to enter the kingdom one must be “born again,” I suspect Nicodemus understands Jesus to mean that we are not good enough to enter the kingdom: we must start over, have a different origin, spring from a different life. Nicodemus thinks Jesus is going too far: people can’t really start over or claim a new life, boast of a new birth, or enjoy a new beginning.
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