Light exposes that which is hidden in darkness it shows things as they really are. God is the Creator of physical light as well as the Giver of spiritual light by which we can see the truth. We do not belong to the night or to the darkness” (1 Thessalonians 5:5). “You are all children of the light and children of the day. God is light, and it is His plan that believers shine forth His light, becoming more like Christ every day. Therefore, we can infer from this verse that Christians are meant to grow in holiness and to mature in faith as they follow Jesus (see 2 Peter 3:18). Whoever follows me will never walk in darkness, but will have the light of life” (John 8:12). Jesus said, “I am the light of the world. They are made partakers of God’s divine nature, “having escaped the corruption in the world caused by evil desires” (2 Peter 1:4). Those who know God, who walk with Him, are of the light and walk in the light. If we do not have the light, we do not know God. Light is part of His essence, as is love (1 John 4:8).The message is that God is completely, unreservedly, absolutely holy, with no admixture of sin, no taint of iniquity, and no hint of injustice. First John 1:6 says that “if we claim to have fellowship with him and yet walk in the darkness, we lie and do not live out the truth.” Verse 5 says, “God is light in him there is no darkness at all.” Note that we are not told that God is a light but that He is light. If light is a metaphor for righteousness and goodness, then darkness signifies evil and sin. The fact that God is light sets up a natural contrast with darkness. Psalm 76:4 says of God, “You are radiant with light.”
Jesus used light as a picture of good works: “Let your light shine before others, that they may see your good deeds” (Matthew 5:16). Proverbs 4:18 symbolizes righteousness as the “morning sun.” Philippians 2:15 likens God’s children who are “blameless and pure” to shining stars in the sky.