John 3:4

John 3:4. Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother’s womb, and be born?

His religion was external, you see; he could not grasp the spiritual idea which Christ had set before him. This matter of the new birth is very simple to all of us who know what Jesus meant, but it was exceedingly difficult to Nicodemus; as it has been to all but those who have experienced it.