6. saw him lie, and knew, &c.--As He doubtless visited the spot just to perform this cure, so He knows where to find His patient, and the whole previous history of his case (Joh 2:25).
      Wilt thou be made whole?--Could anyone doubt that a sick man would like to be made whole, or that the patients came thither, and this man had returned again and again, just in hope of a cure? But our Lord asked the question. (1) To fasten attention upon Himself; (2) By making him detail his case to deepen in him the feeling of entire helplessness; (3) By so singular a question to beget in his desponding heart the hope of a cure. (Compare Mr 10:51).

JFB.