Genesis describes light appearing at God’s command, and Revelation describes the Lamb as the light of the New Jerusalem. Between those passages, Scripture says that God is light and that Jesus is the true Light. These descriptions teach us who God is, how He makes Himself known, and why receiving His light changes the way we live.
Created Light and the God Who Is Light
Genesis begins with God creating the heavens and the earth. Darkness covered the deep, and the Spirit of God hovered over the waters. Before the account introduces the sun, moon, and stars, God commands light to appear:
Then God said, “Let there be light”; and there was light. And God saw the light, that it was good; and God divided the light from the darkness.
This is the first command recorded after the opening statement about creation. Light comes into being because God speaks; it is not an eternal power alongside Him. He calls it good and separates it from darkness. Both its existence and its place in creation depend on His authority.
On the fourth day, God appoints the heavenly lights to give light on the earth and mark days, seasons, and years:
Then God made two great lights: the greater light to rule the day, and the lesser light to rule the night. He made the stars also.
The order prevents us from confusing the sun with the source of God’s power. God had already made light before appointing the sun to rule the day. The moon and stars also fulfill purposes He assigned them. People may worship these objects, but Genesis presents them as parts of His creation, with no right to the worship owed to their Maker.
Genesis does not tell us how the first day’s light operated. I can receive the sequence it gives without supplying a physical explanation the passage leaves unrecorded. God did not need the sun to create light. Revelation will later describe His glory illuminating a city that has no need of the sun’s light.
When John declares that God is light, however, he is describing God’s nature rather than identifying Him with the physical light He created:
This is the message which we have heard from Him and declare to you, that God is light and in Him is no darkness at all.
There is no corruption, deceit, or evil in God. His holiness is complete, and everything He reveals is true. I cannot attribute a hidden willingness to lie or do wrong to Him, as though He had an untrustworthy side we have not yet discovered. The study on the holiness of God considers that purity more closely.
The Hebrew word or and the Greek word phos are ordinary words for light used in these passages. Knowing the word does not settle what a particular passage means. Genesis describes created brightness; John describes God’s holy nature. Elsewhere light expresses revealed truth, guidance, salvation, joy, or life, and it also describes radiant glory. We need the surrounding verses to understand which sense is intended.
David describes his confidence in the Lord amid danger:
The LORD is my light and my salvation; whom shall I fear? The LORD is the strength of my life; of whom shall I be afraid?
The Lord Himself is David’s light and salvation. His confidence rests on who God is, not on his ability to avoid every threatening circumstance. When I am afraid, I need more than an encouraging image. The God who knows the danger is also the One who can sustain and save me. His holiness gives me reason to trust Him, because there is no deception in the One to whom I am praying. The study on the characteristics of God develops these connected truths about His character.
God’s Word Gives Light
God gives understanding through what He says. Scripture reveals His character, exposes sin, explains salvation, and instructs His people in obedience. The psalmist describes that instruction through the image of light along a path:
Your word is a lamp to my feet and a light to my path.
The entrance of Your words gives light; it gives understanding to the simple.
A lamp helps someone see where to place his feet. God’s Word likewise gives actual direction, rather than merely making us feel more hopeful about a choice we have already made. If Scripture tells me to speak truthfully, I cannot excuse a lie by claiming that I felt led to say it. Private impressions and popular opinion must be judged by His Word.
The promise of understanding for the simple also leaves no room for intellectual conceit. We should study carefully, but we do not have to acquire a reputation for brilliance before we can receive God’s instruction. Nor does accumulating information equal obedience. I can know the wording of a command and still refuse to let it govern my conduct.
Biblical light therefore gives us more than positive thinking or confidence in humanity’s gradual improvement. Learning more does not by itself deliver us from sin. Scripture tells us about creation, rebellion, judgment, and God’s provision of redemption. Its truth can comfort someone who recognizes his need and confront someone determined to excuse himself. Faith receives what God says, and obedience follows as we bring our judgments and desires under His instruction.
Jesus Is the True Light
John introduces Jesus as the eternal Word who was with God and was God. All things were made through Him, so He cannot be placed among the created teachers who offer religious insight. He possesses life in Himself and makes the Father known:
In Him was life, and the life was the light of men. And the light shines in the darkness, and the darkness did not comprehend it.
The NKJV uses “comprehend” in John 1:5, while other translations use “overcome.” The underlying verb can concern grasping or mastering, and the NET Bible note discusses the wording. John’s Gospel describes people refusing Christ while also showing that their rejection cannot defeat the Light who continues to shine.
That was the true Light which gives light to every man coming into the world.
Created light depends upon its Maker. Conscience can bear witness to right and wrong, and the Law can expose sin. Neither can redeem us, nor can our obedience give us new life. The prophets carried God’s Word to His people, but Jesus is the eternal Son Himself, fully God, who became fully man. He reveals the Father perfectly and gives the life no created teacher can supply. The study on the deity of Jesus examines that identity.
Jesus made His claim plainly during His earthly ministry:
Then Jesus spoke to them again, saying, “I am the light of the world. He who follows Me shall not walk in darkness, but have the light of life.”
He promises the light of life to those who follow Him. Isaiah had foretold light shining upon people who lived under the shadow of death:
The people who walked in darkness have seen a great light; those who dwelt in the land of the shadow of death, upon them a light has shined.
Matthew identifies Jesus’ ministry in Galilee as the fulfillment of Isaiah’s promise. The people there needed more than advice, which could neither forgive their sins nor overcome death. They needed the Son who had come to save them and fulfill God’s kingdom promises.
The sinless Son bore our sins in His innocent body, voluntarily giving Himself to be slain as the perfect sacrifice for sinners. Wicked people inflicted His bodily suffering and death. His sacrifice was complete when He had shed His blood and died, before His burial and bodily resurrection. He saves as our substitute, giving Himself for us. An abstract principle of light or a program of self-improvement cannot accomplish that redemption.
John 3 explains why people resist the Light who has come:
And this is the condemnation, that the light has come into the world, and men loved darkness rather than light, because their deeds were evil.
But he who does the truth comes to the light, that his deeds may be clearly seen, that they have been done in God.
The darkness here conceals evil deeds. People refuse the light because they do not want their conduct exposed. That is more serious than simply lacking information. A person can defend a respectable appearance while protecting unbelief, impurity, hatred, or false worship underneath it. Christ’s truth reaches the conduct and the heart that appearances cannot hide from God.
Coming to the light means receiving the truth instead of treating it as an enemy. When John describes deeds done in God, he is not saying that we must first produce enough goodness to earn salvation. God is at work, calling sinners to respond honestly to His truth. Those who believe in Christ receive life, while those who refuse Him remain under condemnation. Having our sin exposed can be a mercy that leads to repentance, and persistent refusal leaves the sinner without excuse.
Walking in the Light
Paul grounds the believer’s conduct in a changed relationship with Christ:
For you were once darkness, but now you are light in the Lord. Walk as children of light.
Paul describes a change in the people themselves: they are now light “in the Lord.” Their conduct is to grow out of the new life they have received from Christ; it is not a means of earning His acceptance.
And have no fellowship with the unfruitful works of darkness, but rather expose them.
Refusing fellowship with those works means that we cannot defend or participate in the wrongdoing Christ exposes. That does not require contempt for the people who need His mercy. It requires honesty about what is wrong and a refusal to use friendship, advantage, or religious loyalty as an excuse to approve it.
John connects walking in the light with fellowship and Christ’s cleansing blood:
But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.
The following verses rule out the idea that walking in the light requires pretending to be sinless. In 1 John 1:8–10, John calls the denial of sin self-deception and directs us to confess our sins. We bring wrongdoing under God’s judgment instead of concealing it, and we depend on Christ’s blood for cleansing. Our honesty does not replace His saving work.
If I spread an unfair accusation, I should correct what I said and seek forgiveness from the person I harmed. Reading about light while continuing to defend the accusation would evade the very truth I claim to receive. Hatred toward a brother also contradicts a claim of close fellowship with God. His light reaches into private conduct and into the words and actions through which we treat other people.
We need discernment here. Does a teaching agree with Scripture? Am I protecting a practice from honest correction? Can I pursue this desire without disobeying God? Walking in the light means welcoming His truth into those questions because the Lord who exposes sin is also the One who forgives. It is not a demand to display every private matter before everyone, but a call to stop hiding wrongdoing from God and those we have wronged.
Unapproachable Glory and Everlasting Light
Scripture also uses light to describe God’s majesty. Paul speaks of glory beyond what we can approach on our own:
Who alone has immortality, dwelling in unapproachable light, whom no man has seen or can see, to whom be honor and everlasting power. Amen.
God alone has immortality in Himself; He does not receive His life from another being. Fallen humanity cannot bear the unveiled fullness of His glory. Paul’s words should humble us rather than make us conclude that God is absent or indifferent. The One we cannot approach through our own strength has made Himself known through His Son.
The eternal Son became man without ceasing to be God. His divine glory was veiled in genuine humanity, yet Peter, James, and John were permitted a glimpse of His majesty at the transfiguration:
And He was transfigured before them. His face shone like the sun, and His clothes became as white as the light.
Jesus lived among sinners with patience and mercy while remaining the Lord of glory. We cannot reduce Him to a comforting mood or reshape Him to approve whatever we prefer. Through His saving blood, sinners are welcomed into fellowship with the holy God. We can draw near because He has provided the mercy we need.
Isaiah had already spoken of the Lord as His people’s everlasting light:
The sun shall no longer be your light by day, nor for brightness shall the moon give light to you; but the LORD will be to you an everlasting light, and your God your glory.
The Bible’s final vision carries us to the new heaven and new earth. John sees the New Jerusalem coming down from God, who dwells with His people. In Revelation 21:1–4, death, sorrow, and pain have passed away. The description includes a city whose light does not depend on sun or moon:
The city had no need of the sun or of the moon to shine in it, for the glory of God illuminated it. The Lamb is its light.
There shall be no night there: They need no lamp nor light of the sun, for the Lord God gives them light. And they shall reign forever and ever.
God’s glory illuminates the city, and the Lamb is its light. The sun was a good creation, but it was never something God needed in order to provide light. Genesis records light before the sun, and Revelation describes the city illuminated by God Himself. The One who gave light at creation will not lack the power to sustain His people forever.
Revelation 22:3–4 also promises that the curse will be gone, God’s servants will serve Him, and they will see His face and bear His name. The hope is life with God for His redeemed people in the creation He has made new. The study on the heavenly Jerusalem examines the city more fully.
I look forward to resurrection life with God under Christ’s reign. The Lamb who will illuminate the city is the Savior who shed His blood and rose bodily. Our hope rests on His saving work and His promise, rather than on the expectation that human progress will eventually remove darkness.
Grief, confusion, persecution, and false teaching are real troubles now. Grieving or feeling afraid does not mean that a believer has returned to moral darkness. We can bring those burdens to the Lord while continuing to obey Him. Christ will return bodily as King, and the future He promises will outlast every present sorrow and every power that opposes Him.
My Final Thoughts
God created light, reveals truth through His Word, and makes Himself known in Jesus Christ, the true Light. His holiness exposes sin without leaving sinners to invent their own way of escape. We receive forgiveness through the Son who shed His blood, died, and rose bodily.
I want that truth to govern the way I respond when God’s Word corrects me. Being light in the Lord gives us reason to confess sin, turn from it, and trust Christ’s cleansing. We can walk by His Word now while looking forward to the city where the Lamb will be our light forever.