John 1:5

And the light shineth, or did shine, in darkness. Many understand this, that the light of reason, which God gave to every one, might have brought them to the knowledge of God by the visible effects of his Providence in this world: but the darkness did not comprehend it, because men, blinded by their passions, would not attend to the light of reason. Or we may again understand it, with Maldonatus, of the lights of grace, against which obstinate sinners wilfully shut their eyes. (Witham)

5. The manifestation of him to the children of men. It might be objected, If this eternal Word was all in all thus in the creation of the world, whence is it that he has been so little taken notice of and regarded? To this he answers (v. 5), The light shines, but the darkness comprehends it not. Observe,

We have here the testimony of John, which he delivered to the messengers who were sent from Jerusalem to examine him. Observe here,

in this Word was life corporal, spiritual, eternal; it was in him as in the fountain. Some understand this of corporal life, both in the first being and preservation of it; it is certain that this is in Christ, for he upholdeth all things by the word of his power, Heb 1:3 Act 17:28; and thus it is another demonstration of the Deity of Christ. Others think that here is rather a transition from creation to redemption; you hath he quickened, Eph 2:1. Others understand it of eternal life, because our evangelist most generally taketh the term life, as a benefit flowing from Christ, in this sense, as Eph 3:16, and Eph 4:14, and in a multitude of other texts. I know no reason why we should not understand it of all life; all life being in Christ, as God equal with the Father; and spiritual and eternal life flowing also from him in a more peculiar consideration, as Mediator. but though as God he distributes life according to their degree to all his creatures, yet he is the peculiar light of men, enlightening their minds with light of which vegetative and sensitive creatures are not capable; so as by light is not here to be understood the emanations of any lucid bodies, as that of the sun or stars, for other creatures as well as men are capable of that; nor is it to be understood of the light of reason, though that be the candle of the Lord in the soul; but that light by which we discern the things of God; in which sense the apostle saith, Eph 5:8, Ye were darkness, but now ye are light in the Lord. And therefore he saith of men, exclusively to angels, who though lightsome, noble creatures, yet had not their nature assumed by Christ, Heb 2:16. Besides that it is said in the next verse, that this light shineth in darkness, that is, amongst many men who yet had reasonable souls, but the darkness comprehended it not. That cannot be, that men did not comprehend reason, but even rational men comprehended not this light of supernatural revelation. So John is said to have come to testify of that light; who did not come to testify of Christ, as the author of reason. Nor is there any text of Scripture in which the term light signifieth reason.

Verses 1-5 The plainest reason why the Son of God is called the Word, seems to be, that as our words explain our minds to others, so was the Son of God sent in order to reveal his Father's mind to the world. What the evangelist says of Christ proves that he is God. He asserts, His existence in the beginning; His coexistence with the Father. The Word was with God. All things were made by him, and not as an instrument. Without him was not any thing made that was made, from the highest angel to the meanest worm. This shows how well qualified he was for the work of our redemption and salvation. The light of reason, as well as the life of sense, is derived from him, and depends upon him. This eternal Word, this true Light shines, but the darkness comprehends it not. Let us pray without ceasing, that our eyes may be opened to behold this Light, that we may walk in it; and thus be made wise unto salvation, by faith in Jesus Christ.