John Calvin's Commentary on the Bible - John 3:1
Verse 1 1.Now there was a man of the Pharisees. In the person of Nicodemus the Evangelist now exhibits to our view how vain and fleeting was the faith of those who, having been excited by miracles, suddenly professed to be the disciples of Christ. For since this man was of the order of the Pharisees, and held the rank of a ruler in his nation, he must have been far more excellent than others. The common people, for the most part, are light and unsteady; but who would not have thought that he... read more
Adam Clarke's Commentary on the Bible - John 3:4
How can a man be born when he is old? - It is probable that Nicodemus was pretty far advanced in age at this time; and from his answer we may plainly perceive that, like the rest of the Jews, and like multitudes of Christians, he rested in the letter, without paying proper attention to the spirit: the shadow, without the thing signified, had hitherto satisfied him. Our Lord knew him to be in this state, and this was the cause of his pointed address to him. read more