See the verse.
This is the message we have heard from him and proclaim to you, that God is light, and in him is no darkness at all. (1 John 1:5).
I like thinking of Jesus as Light. It's one of my favorite ways to think of Him. I use a lighthouse quite often in my blog banners and avatars.
God is light. What does that mean? We know what it means on a surface level. We understand and can read the words on the page. It's easy enough to understand the fact of the sentence. But what does it mean, spiritually? How can it inform me of His attributes and increase my knowledge of Him so I can love Him more and worship Him properly?
The word light in this verse is from a Greek word meaning phós. Strong's Concordance says it is defined this way-
in the NT, the manifestation of God's self-existent life; divine illumination to reveal and impart life, through Christ.When were saved, our citizenship transfers, from being children of darkness to children of the Light. (1 Thessalonians 5:5). Light does reveal, doesn't it? It reveals all. What glorious light He is!
God is light—What light is in the natural world, that God, the source of even material light, is in the spiritual, the fountain of wisdom, purity, beauty, joy, and glory. As all material life and growth depends on light, so all spiritual life and growth depends on GOD. As God here, so Christ, in 1 Jn 2:8, is called "the true light." Jamieson, R., Fausset, A. R., & Brown, D. Commentary Critical and Explanatory on the Whole Bible
As a matter of fact, look how many times Apostle John referred to Jesus as Light- (John 1:4–5, 7–9; 3:19–21; 8:12; 9:5; 12:35–36, 46; Rev. 21:23). One cannot walk in His light and also be walking in darkness (sin). One cannot serve two masters. Light is Light and darkness is darkness, and the two can't dwell with each other. If we claim to be in the Light but are holding on to sin without repentance we are lying that we're in fellowship with the Light. Disobedience is dark indeed.
God is purity itself. He is holy without blot or stain. Is there anything on earth that is pure? I think not. Gold has dross which must be extracted. A newborn babe, though innocent looking, has a sin nature. Even the light through which we see vistas and each other, is polluted. The cleanest and clearest thing on earth swill is subject to the curse.
God's glorious light must be ablaze with stunning purity and glorious illumination. Sometimes at church where the lights are a bit dimmer, a lady's diamond ring might catch the light and sparkle for just that flash of a moment. I always try to hold onto that flash but it's momentary. As beautiful as it is, it cannot be captured.
Matthew Henry wrote,
This report asserts the excellency of the divine nature. He is all that beauty and perfection that can be represented to us by light. He is a self-active uncompounded spirituality, purity, wisdom, holiness, and glory. And then the absoluteness and fulness of that excellency and perfection. There is no defect or imperfection, no mixture of any thing alien or contrary to absolute excellency, no mutability nor capacity of any decay in him:Matthew Henry’s commentary on the whole Bible
Picture the glittering brightness of this scene, our prophetic future: (Revelation 22:1-5).
1Then the angel showed me the river of the water of life, bright as crystal, flowing from the throne of God and of the Lamb 2through the middle of the street of the city; also, on either side of the river, the tree of life with its twelve kinds of fruit, yielding its fruit each month. The leaves of the tree were for the healing of the nations. 3No longer will there be anything accursed, but the throne of God and of the Lamb will be in it, and his servants will worship him. 4They will see his face, and his name will be on their foreheads. 5And night will be no more. They will need no light of lamp or sun, for the Lord God will be their light, and they will reign forever and ever.
His morally perfect sinless soul will illuminate the entire universe. His light will blaze out in uninterrupted glory, in a purity so clear that God, who IS light, will be our light. What a day that will be.