Why is God described as light?
The description of God as Light captures the essence of His nature and is foundational to the rest of the epistle. However, unlike the straightforward expressions “God is spirit” (meaning that God is immaterial in form; compare John 4:24 with Luke 24:39) and “God is love” (meaning that the persons of the Trinity love one another and mankind; cf. 3:17; 4:7, 16; Mic. 7:18; Zeph. 3:17; John 5:42; 15:10; Rom. 5:5, 8; 8:39; Eph. 2:4; Titus 3:4), the idea that God is Light (cf. Ps. 78:14; Isa. 60:19–20; John 1:9; 3:19; 8:12; 9:5; 12:46; Acts 9:3; Rev. 21:23) is more complex. Throughout the Scriptures, God and His glory are often described in terms of light. For example, during the exodus God appeared to the Israelites in the form of light: The Lord was going before them in a pillar of cloud by day to lead them on the way, and in a pillar of fire by night to give them light, that they might travel by day and by night. He did not take away the pillar of cloud by day, nor the pilla