John 3:4

“Jesus replied, "Very truly I tell you, no one can see the kingdom of God unless they are born again."”

Contextual: Nicodemus's question is a direct response to Jesus' statement about being born again.

“"How can this be?" Nicodemus asked.”

Contextual: Continues the dialogue and Nicodemus's struggle to understand.

“Therefore the Jews started quarreling among themselves, saying, “How can this man give us his flesh to eat?””

Shares the theme of questioning the possibility of a seemingly impossible statement.

“Without weakening in his faith, he faced the fact that his body was as good as dead—since he was about a hundred years old—and that Sarah’s womb was also dead. Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God,”

Illustrates a similar question of impossibility related to old age and childbearing, contrasting faith with doubt.

“As soon as the king of Israel read the letter, he tore his robes and exclaimed, “Am I God? Can I kill and bring back to life? Why does this fellow send someone to me to be healed of his leprosy? See how he is trying to pick a quarrel with me!””

Presents another instance of someone questioning the feasibility of a seemingly impossible task.