The same came to him by night, and said to him, "Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do, unless God is with him."

 Nicodemus was a Pharisee, and it is astonishing that a man who regarded goodness in that light and who had given himself to that kind of life in the conviction that he was pleasing God should wish to talk to Jesus at all. 