There are two actors in this scene of John's gospel: Jesus and Nicodemus. Nicodemus is not a popular figure in the gospels. He appears only a couple of other times in John's record. The last picture of him is in John 19. He and Joseph of Arimathea asked for the body of Jesus after He was crucified in order that He might have a decent burial.
One of Rembrandt's most famous etchings portrays that scene. The limp, dead body of Jesus was slowly taken down from the cross. Joseph of Arimathea, dressed as the person that he was, in all his finery, stands close by. In the darkness, further away, veiled in shadow as only Rembrandt could do it, with his face lined in sorrow, is Nicodemus. He is holding in his hands the linen cloth in which Jesus' body would be buried. The Gospel says that Nicodemus also brought with him a mixture of spices, myrrh and aloes, "about a hundred pounds". One wonders what Nicodemus must have been thinking as he stood there, waiting for the body of Christ to be taken down from the cross. Obviously, much was going on in his life this wealthy man, bringing fine linen and a bountiful amount of expensive spices to anoint the body of one who had died as a common criminal. Was he still mystified as he had been when Jesus told him that he must be born again? Was he still puzzled by the response of Jesus when he pressed his question about how one could be born again? Jesus' answer had been totally unsatisfying for his rational mind: "The Spirit blows where it wills you feel it, and you hear the sound of it but you don't know from where it comes or where it goes. So is everyone who is born of the Spirit."
Did he yet not understand? – it is nothing you do, Nicodemus, Jesus said. The Spirit does it – it is all grace. Position, honor, success, responsibility, who you know, what you have; it counts for nothing. It's all grace.
That's the issue Jesus is questioning Nicodemus about in our scripture lesson today. "Are you the teacher of Israel, and do not know these things?" It's a question relevant to us because it's the question of grace.