Genesis begins with light appearing at God’s command, and Revelation ends with the Lamb as the light of the New Jerusalem. Between those scenes, Scripture says God is light and calls Jesus the true Light. I want to follow these passages together and ask what they teach us about living before God.
Created Light and the God Who Is Light
The Bible introduces light before it introduces the sun, moon, and stars as appointed lights. Genesis begins with God creating the heavens and the earth. The earth is without form and void, darkness covers the deep, and the Spirit of God hovers over the waters. Then God speaks, and light exists by His command.
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 recorded command after Scripture’s opening statement about creation. Light is not eternal beside God. It is His creature, summoned into being through His word. Once light exists, God declares it good and separates it from darkness under His authority. Genesis never presents light as a power that exists on its own.
Only on the fourth day does God appoint the sun, moon, and stars to mark seasons and give light on the earth.
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.
I think the order is a detail we should not overlook. The sun serves God; it is not the source of His power. The moon and stars are also appointed instruments rather than divine beings. Ancient nations often worshiped heavenly bodies, but Genesis strips them of deity. God made them and gave them their function, so every heavenly light remains under His command.
We should still speak carefully about the light of day one. Genesis tells us that God made light before the sun, but it does not explain the created mechanism. We do not need to invent one. The passage establishes that God does not depend upon the sun to create, separate, or sustain light. Later, Revelation shows His glory illuminating a city without sun or lamp. From beginning to end, the theme remains under God’s authority.
That prepares us for John’s simple statement: God is light. John is not saying that God is physical energy. He is revealing God’s holy nature.
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.
No hidden corruption exists in God, and He never deceives. There is no moral shadow in Him. He knows all things, and no evil has any place in His being. God is pure in Himself and true in everything He reveals. Scripture may use light for created brightness or for the radiant glory of God. In other passages, it points to moral purity and revealed truth. It can also describe the salvation and guidance God gives, while John connects it with joy and life. These meanings belong together because God is their source, but we should not blur them. When John says God is light, he declares that darkness has no place in God.
David gives this doctrine a personal voice. The Lord does more than give light; He is David’s light and salvation.
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?
For a believer, God’s light is not an abstract idea left on a page. His presence brings clarity when fear confuses the heart. He gives salvation where guilt condemns and strength where a person trembles. His light is holy enough to expose sin, yet gracious enough to lead sinners toward mercy.
God’s Word Gives Light
Because God is light, His Word gives light. Scripture does not leave us guessing about who God is or what sin is. It explains how salvation comes, then shows God’s people how to walk. His Word reveals truth and gives understanding when the path ahead feels narrow or confused.
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.
These verses guard us from two errors. One leaves Scripture behind while seeking spiritual light through private impressions or whatever ideas are currently popular. The other reads the Bible without surrender, as though collecting information were enough. God’s Word gives light when we receive it as His Word and believe what He says. Obedience follows that faith as we let His truth judge the thoughts and intentions of the heart.
Psalm 119 also humbles human pride. The simple can receive understanding because God gives light through His own words. His people do not have to become experts in worldly wisdom before they can obey Him. The right response is not to admire the lamp from a distance. We must walk by what it shows.
This is why biblical light differs from vague optimism. The world may use light to mean a positive feeling or a journey of personal discovery. Some speak as though humanity is naturally becoming better. Scripture begins with creation and tells the truth about sin. It warns of judgment, but it also reveals God’s mercy and the redemption He provides. Because this light comes from the God who knows every heart, the same passage may comfort someone who is broken and confront someone who is satisfied with himself.
The Hebrew word or is the ordinary word for light in Genesis 1:3 and many other Old Testament passages. The Greek word phos appears in John 1, John 8, and 1 John 1. The words themselves do not force every passage to mean the same thing. Their context may describe brightness, truth, purity, life, guidance, or divine glory, while God remains the source of every good light.
Jesus Is the True Light
The theme reaches its fullest revelation in Jesus Christ. John opens his Gospel by identifying Jesus as the eternal Word who was with God and was God. All things were made through Him. In Him was life, and that life was the light of men. Christ is not a created teacher carrying religious insight. He is the eternal Son, fully God, who became fully man to save sinners.
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.
That was the true Light which gives light to every man coming into the world.
John calls Him the true Light because every other light is dependent upon Him. Created light points beyond itself. Conscience bears witness, but it cannot redeem. The Law exposes sin, yet sinners cannot use their works to make themselves new. The prophets carried God’s Word as servants. Jesus is Light in His own Person because He shares the divine nature with the Father and reveals Him perfectly.
Jesus made the same exclusive claim 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.”
His promise is more than moral improvement. Whoever follows Him has the light of life. Isaiah had already promised that light would shine on people who walked 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 applies that hope to Christ’s ministry in Galilee. Those people needed more than advice. They needed God to reveal Himself and forgive their sins. In Christ, He brought life and fulfilled the kingdom hope He had promised. Scripture therefore sends sinners to Jesus rather than to an abstract principle called light. He is the Word made flesh and the sinless Son of God. He bore our sins in His innocent body on the cross and shed His blood. After He died, He rose bodily. The Light of the world saves by His substitutionary, finished work rather than by offering a vague path of enlightenment.
Christ’s coming also exposes the human heart. John 3 says that people loved darkness rather than light because their deeds were evil. In that passage, darkness is not innocent ignorance. It is the covering people choose because they want their sin hidden.
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.
This helps explain why sinners resist Christ. His light uncovers the guilt and unbelief that self-righteousness tries to hide. Impurity and false worship can no longer pretend to be innocent, and even the heart’s hatred of God is exposed. Someone who wants sin protected will not welcome Him. The person being drawn by truth comes into the light, not because he has earned salvation, but because God is at work and truth no longer feels like an enemy.
The exposing work of light is mercy when it leads to repentance. It becomes judgment when people hate and refuse it. The same sun that melts wax can harden clay. Christ saves those who believe, but the Light also leaves the unbeliever without excuse.
Walking in the Light
Believers are called to walk in the light because they now belong to the Lord. Paul does not merely say that Christians once lived in darkness. He says they were darkness, but now they are light “in the Lord.” Their changed life grows from union with Christ, not from an attempt to save themselves.
For you were once darkness, but now you are light in the Lord. Walk as children of light.
And have no fellowship with the unfruitful works of darkness, but rather expose them.
Walking in the light means living openly before God. When His Word exposes hidden sin, we confess it instead of protecting it. We tell the truth because we no longer need darkness as a cover, and we turn from impurity. Our fellowship rests upon Christ’s cleansing blood rather than performance or pride.
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.
I find John’s next point deeply reassuring. Walking in the light does not mean pretending to have no sin. John immediately warns that a claim of sinlessness is self-deception. A believer walks in the light by bringing sin under God’s truth instead of hiding it. He confesses rather than conceals it. His trust rests in Christ’s blood, and fellowship with God and His people continues.
God’s light also changes the way Christians treat one another. Hatred belongs to darkness, while love belongs to light. No one can claim close fellowship with God while choosing to cherish hatred against a brother. The light reaches into private life, then becomes visible in our relationships and in the words we speak.
Walking in God’s light gives us a pattern for discernment as well. Does a teaching agree with Scripture? Can this desire live honestly before God? Does a relationship encourage obedience, or is a hidden practice being protected from godly correction? Darkness survives through secrecy and excuse. Light welcomes God’s searching truth because the believer has no better refuge than the Lord who forgives and cleanses.
Unapproachable Glory and Everlasting Light
Scripture also uses light to speak about glory beyond the strength of any creature. Paul says God dwells in unapproachable light.
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’s unapproachable light does not mean that He is absent from His people. Instead, it declares His majesty. He alone has immortality in Himself and remains beyond the ability of fallen people to behold in unveiled fullness.
That makes the incarnation even more glorious. The eternal Son did not cease to be God when He became man. His divine glory was veiled in real humanity. At the transfiguration, Peter, James, and John were allowed to see a glimpse of His majesty.
And He was transfigured before them. His face shone like the sun, and His clothes became as white as the light.
The Light of the world walked among sinners with patience and mercy, yet always with divine authority and perfect holiness. His glory should humble our worship. We cannot tame God or pull Him down into our preferences. We cannot reduce Him to a slogan or a mood. He is the Lord of glory. Still, sinners may come near through Christ, cleansed by His blood and received by grace as God’s children.
The Bible’s story of light reaches its final earthly scene in the New Jerusalem. Genesis shows light before the sun. Revelation describes a city that needs neither the sun nor the moon, because the glory of God illuminates it and the Lamb is its light.
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.
These promises do not deny that God made the sun good. They reveal that created lights were never ultimate. No night remains in the city, and neither does hidden corruption or the curse. God’s servants see His face and bear His name. The Lamb who was slain is the lamp of the city. Jesus entered the darkness of this world, shed His blood, died, and rose bodily. He will be the visible glory of the redeemed city forever.
Isaiah had already called the Lord 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.
Our hope is not a vague brightness after death. It is resurrection life with God under Christ’s reign, with darkness removed forever. That hope gives courage now. False teaching and persecution cannot extinguish God’s light. Grief may cloud our view for a time, and spiritual opposition is real, but darkness did not overcome Christ at His first coming. No darkness will stand when He returns bodily as King.
For further study, see A Complete Bible Study on the Characteristics of God, A Bible Study on the Holiness of God, A Complete Bible Study on the Deity of Jesus, and A Complete Bible Study on the Heavenly Jerusalem.
My Final Thoughts
After following this theme from Genesis to the New Jerusalem, I keep coming back to the fact that every good light depends upon God, while He depends on none of them. His holy light exposes what we would rather hide, but He does not leave us searching for our own way out of darkness. Jesus Christ is the true Light. He shed His blood and died to save sinners, then rose bodily. Because believers are now light in the Lord, we can bring sin into the open and trust His cleansing while His Word shows us how to walk. The darkness around us is real, but it is temporary; the Lamb will be the light of God’s people forever.