The creed calls the Son Light from Light. Scripture says God is light, calls Jesus the light of the world, and describes God shining into human hearts. These statements belong together, but each has its own setting. They are not a scientific account of what God is made of.
The Word
φῶς (phōs) means light. The word can name the light by which we see and, in biblical images, the holiness, life, and revelation that come from God.
The image makes something accessible to us without reducing God to a familiar object. We know what it is to stumble in darkness and what changes when light reaches us.
Range of Meaning
First John 1:5 uses light to speak of God in whom there is no darkness. The following verses connect walking in the light with truth, fellowship, confession, and cleansing. Light does not mean that Christians never need forgiveness.
John 1 joins light with the life that is in the Word. John 8:12 joins following Jesus with having the light of life. First Timothy 6:16 speaks of God’s unapproachable light, reminding us that revelation is his gift rather than our conquest of his hidden majesty.
These uses are related, but light is not a code word with one expanded definition to insert everywhere.
Where You’ll Meet It
John announces:
“God is light, and in him there is no darkness at all.” (1 John 1:5, NET)
The same passage promises cleansing through the blood of Jesus (1:7). God’s holiness exposes sin, and his Son’s blood cleanses sinners. Walking in the light includes telling the truth about the need for that cleansing.
In 2 Corinthians 4:6, Paul recalls God’s command that light shine from darkness and applies the image to knowing God’s glory in Christ’s face. Knowledge of God is given through Christ, not discovered by looking behind him for a more authentic revelation.
What Confessional Lutherans Hear
The Nicene Creed’s Light from Light confesses the Son’s true deity and his relation to the Father. Alongside its confession of his eternal begetting and one divine being with the Father, the image excludes treating him as a creature who possesses only a borrowed resemblance to God.
That confession does not rest on an experiment with a lamp. Created light offers an image; it does not explain how God must exist. Apaugasma explores the related description of the Son as radiance in Hebrews 1:3.
The light that makes God known is not an inward feeling we must generate before his promises count. God directs us to Christ through the proclaimed Word. His gifts in Baptism and the Supper rest on his promise, even when our understanding feels dim and our emotions are unsettled.
So What
You do not need to hide sin in order to remain in the light. Bring it into the confession that First John teaches, where the promise of cleansing is spoken to sinners.
And you do not need to see through every mystery to know where God has made himself known. Attend to Christ. The light by which you know the Father’s mercy comes from him.