John 9:5

As long as I am in the world These words show what our Lord meant by the day mentioned in the preceding verse, namely, the time he should be in the world. So long, says he, I am the light of the world Teaching men inwardly by my Spirit, and outwardly by my preaching, what is the will of God; and showing them by my example how to perform it. “While he continued on earth he was the light of the world by his personal ministry and miracles; and he would be the same by his doctrine and his Spirit to the end of time.” Scott. And to teach us how able and willing he is to communicate divine illumination to the souls of men, he often restored sight to such as were corporally blind; and he was about to do it now. For, as Dr. Macknight justly observes, “our Lord's miracles were designed, not only as proofs of his mission, but to be specimens of the power which he possessed as Messiah. For example, by feeding the multitude with meat that perisheth, he signified that he was come to quicken and nourish mankind with the bread of life, that sovereign cordial and salutary nutriment of the soul. His giving sight to the blind was a lively emblem of the efficacy of his doctrine [when accompanied by his grace] to illuminate the blinded understandings of men. His healing their bodies represented his power to heal their souls, and was a specimen of his authority to forgive sins, as it was a real, though but a partial removal of its punishment. His casting out devils was an earnest of his final victory over Satan and all his associates. His raising particular persons from the dead was the beginning of his triumph over death, and a demonstration of his ability to accomplish a general resurrection. And, to give no more examples, his curing all promiscuously, who applied to him, showed that he was come, not to condemn the world, but to save even the chief of sinners. Accordingly, at performing these miracles, or soon after, when the memory of them was fresh in the minds of his hearers, we often find him turning his discourse to spiritual things that were signified by them, as in the case before us.”