Then spake Jesus again unto them,.... Syriac fragment of Bishop Usher's, published by De Dieu, prefaces this verse thus, "when they were gathered together", Jesus said, &c. that is, the Scribes and Pharisees, who went out and returned again; or some others of them, who came after this, to whom Christ addressed himself thus:I am the light of the world; which he might say, on occasion of the rising sun, which was now up, and might shine brightly in their faces; see Joh 8:2; which is Mlweh rwa, "the light of the world", as Aben Ezra in Ps 19:8 rightly calls it: thus on occasion of the water in Jacob's well, he discoursed of living water; and upon the Jews at Capernaum mentioning the manna, he treated at large concerning himself as the bread of life: and he might also make use of this character, and apply it to himself, with a view to some passages in the Old Testament, which speak of him under the metaphor of the sun, as Ps 84:11, and represent him as the light; and the Jews themselves say, that light is one of the names of the Messiah; and God himself is called by them, the light of the world : and likewise he may have regard to those pompous titles and characters, which the Jewish doctors assumed arrogantly to themselves, and oppose himself to them; for they not only called Moses their master, Mlweh rwa, "the light of the world" , and also the law of Moses , but their Rabbins and doctors;See Gill on "Mt 5:14".
By the world here is meant, not the whole world, and all the individuals of it; for though Christ, as the Creator of all things, is the light of men, and does lighten every individual man with the light of nature and reason, yet not in a spiritual and saving manner, as is here intended; nor the whole body of the elect of God, though they are sometimes called the world, being the better part of it, and are made light in the Lord, in a special sense; nor the Jews only, and the chosen of God, among them, though Christ was a great light to many of them, that sat in darkness, and in the shadow of death; but the Gentiles are here designed, who were usually called by the Jews, the world; See Gill on "Joh 3:16".
And these were in gross darkness before the coming of Christ, about the Divine Being, concerning the object, nature, and manner of worship; the Scriptures, the law, and Gospel; the Messiah, and his office and work; the Spirit of God, and his operations of grace; the resurrection of the dead, and a future state; now Christ came to be a light of the Gentiles, as well as the glory of his people Israel: our Lord seems to have respect to the prophecy of him, in Isa 42:6, as well as alludes to the sun in the firmament; whose light is diffused to all the nations of the earth, and not confined to one spot of land only: but since Christ was the minister of the circumcision, and was sent only to the lost sheep of the house of Israel, it may be asked, how could he be the light of the Gentiles?