A light into the world - John 8:12; John 1:9; John 3:19.

Walk in darkness - In gross and dangerous errors. Darkness is put for error as well as for sin, John 3:19; 1 John 1:5. It is also used to denote the state when the comforts of religion are withdrawn from the soul, Isaiah 8:22; Joel 2:2; Isaiah 59:9; John 8:12.

I am come a light into the world - Probably referring to what his forerunner had said, John 1:5. Before the coming of this Savior, this sun of righteousness, into the world, all was darkness: at his rising the darkness is dispersed; but it only profits those whose eyes are open to receive the rays of this sun of righteousness. See on John 1:5 (note); John 3:19 (note); John 8:12 (note); John 9:5 (note).

I am come a light into the world,.... And even as the light of it, being the sun of righteousness, that was to arise, and now was risen, to enlighten men with the light of the living; see John 3:19;

that whosoever believeth on me should not abide in darkness; God's elect themselves, whilst in a state of unregeneracy and unbelief, are in darkness; when Christ shines in upon them, and infuses the light of faith into them, they are no longer in darkness; the darkness is past, at least in a great measure, and the true light shines; in which they see light, see glory and grace of Christ, and the invisible realities of another world: nor do they continue in the darkness of sin, ignorance, and unbelief; but walk in the light of truth, faith, and holiness, until the perfect day comes, when all the shadows of remaining darkness will flee away.

I am come a light into the world, that whosoever believeth on me should not abide in darkness.

12:44-50 Our Lord publicly proclaimed, that every one who believed on him, as his true disciple, did not believe on him only, but on the Father who sent him. Beholding in Jesus the glory of the Father, we learn to obey, love, and trust in him. By daily looking to Him, who came a Light into the world, we are more and more freed from the darkness of ignorance, error, sin, and misery; we learn that the command of God our Saviour is everlasting life. But the same word will seal the condemnation of all who despise it, or neglect it.