What does John 3:4 mean?
Nicodemus doesn't actually misinterpret Jesus, or take a physical, literal view of His reference to being "born again." The reason he asks the question is because he knows this is not what Jesus meant, but he is confused. Jesus is in fact referring to birth, but not a physical one. Rather, this is a spiritual birth.The term "born again" can become a cliché, but it's an important metaphor. Parents endure pain, so that their child can be changed and inherit their attributes. God endured our pain, in the form of Jesus on a cross, in order to give us a new birth. According to verse 3, being "born again" is an absolute, universal requirement for salvation. The gospel is exclusive—meaning restricted to only a certain group—even though it is offered to everyone. Only those who put their faith in Christ are saved, a concept which the gospel of John will repeat several times (John 3:5; John 3:18; John 3:36; John 14:6).