Nicodemus here directly quotes Jesus' earlier statement about being born again, showing his literal misunderstanding of the metaphor.

In John 6:52, the Jews similarly question the physical impossibility of eating Jesus' flesh — both reflect skepticism about spiritual truths.

In John 4:11, the Samaritan woman also misunderstands Jesus' spiritual language, taking 'living water' literally — similar to Nicodemus's confusion.

John 6:60 records disciples calling Jesus' teaching 'hard' — the same bewilderment Nicodemus shows when hearing about the new birth.

John 6:53 presents another hard saying about eating Christ's flesh, which also causes a 'how can this be?' reaction — mirroring Nicodemus's bewilderment.

1 Corinthians 2:14 directly states the natural man cannot understand spiritual things — which is exactly Nicodemus's struggle with the concept of rebirth.

In 1 Corinthians 15:35, the skeptic asks how the dead are raised — directly parallels Nicodemus' 'how can a man be born?' question.