BIBLE GREEK WORD STUDY
Phos (φῶς) — Light in the Greek New Testament
φῶς (phōs) is the Greek noun for light, used literally of physical light and figuratively of divine truth, life, and witness.
Meaning of the word
φῶς (phōs) is a noun meaning 'light' in the broadest sense—physical illumination or its source, and by extension anything that illuminates or makes visible. The lexicon defines it as 'luminousness,' whether natural or artificial, abstract or concrete, literal or figurative.
The word is related by root to φαίνω (phainō, to shine) and connects conceptually to speech or disclosure (cognate with φημί). This wide semantic range allows φῶς to cover firelight, sunlight, the light of a lamp, or any agent that dispels darkness.
In Johannine theology in particular, φῶς becomes a major metaphor for divine life and truth breaking into a darkened world, encompassing both the reality itself and the witness that points to it.
Usage in Scripture
In Matthew 5:14–16, Jesus calls his disciples 'the light of the world,' telling them to let their light shine before others. Here φῶς functions as a calling: a visible witness whose good works point to God.
In John 1:4–9, φῶς is clustered to present Jesus himself as the true light. Life is identified with light (1:4), the light shines in darkness (1:5), John the Baptist is carefully distinguished from the light he testifies to (1:7–8), and 'the true light' is said to come into the world and give light to every person (1:9).
John 3:19–20 sharpens the metaphor: people are faced with a moral choice between light and darkness. Loving or hating the light is equated with the moral quality of one's deeds, giving φῶς an ethical and eschatological edge.
The word in detail
- G5457 φῶς (phōs, 'light'). The lexicon highlights the word's breadth: natural or artificial, abstract or concrete. Its root connects it to φαίνω (to shine) and loosely to φημί, giving φῶς both a sensory and a revelatory character that the Gospel writers exploit fully.
Example verses
- Matthew 5:14 Disciples are called 'the light of the world,' applying φῶς collectively to the community that visibly witnesses to God in a dark world.
- Matthew 5:16 The disciples' light (φῶς) is to shine before others so that their good works lead observers to glorify the Father—light here is a public, God-directed testimony.
- John 1:4 Life is identified with light: 'the life was the light of men,' giving φῶς an explicitly theological meaning as the content of divine life given to humanity.
- John 3:19 Judgment is framed as the arrival of light in the world and humanity's preference: some love the light, others the darkness, making φῶς a marker of moral allegiance.
Common questions
Is φῶς always used spiritually in the New Testament?
No. The lexicon definition allows literal uses (lamp, fire, daylight), but many of its most theologically weighted occurrences, especially in John, treat it as a metaphor for divine truth and life embodied in Jesus.
How is φῶς related to φαίνω?
They share a common root meaning 'shine, appear.' φῶς names the result (light), while φαίνω names the action (to shine). This is why light imagery in John can naturally merge with the coming and shining of the Word.
Why is John the Baptist said to 'not be the light'?
The text carefully distinguishes the witness (John) from the reality (Christ). John 1:8 uses φῶς to affirm that he was sent to point to the true light, not to be identified with it himself.