Jamieson, Fausset and Brown on John 3:9-10

9-10. How, &c.--Though the subject still confounds Nicodemus, the necessity and possibility of the new birth is no longer the point with him, but the nature of it and how it is brought about [Luthardt]. "From this moment Nicodemus says nothing more, but has sunk unto a disciple who has found his true teacher. Therefore the Saviour now graciously advances in His communications of truth, and once more solemnly brings to the mind of this teacher in Israel, now become a learner, his own not guiltless ignorance, that He may then proceed to utter, out of the fulness of His divine knowledge, such farther testimonies both of earthly and heavenly things as his docile scholar may to his own profit receive" [Stier].