God is light meaning biblical truth
God is light . In Scripture, light and darkness are very familiar symbols. Intellectually, “light” refers to biblical truth while “darkness” refers to error or falsehood (Ps. 119:105; Prov. 6:23; John 1:4; 8:12). Morally, “light” refers to holiness or purity while “darkness” refers to sin or wrongdoing (Rom. 13:11–14; 1 Thess. 5:4–7). The heretics claimed to be the truly enlightened, walking in the real light, but John denied that because they do not recognize their sin. About that basic reality, they were unenlightened. no darkness at all. With this phrase, John forcefully affirms that God is absolutely perfect and nothing exists in God’s character that impinges upon His truth and holiness (cf. James 1:17). MacArthur, J., Jr. (Ed.). (1997). The MacArthur Study Bible (electronic ed., p. 1964). Nashville, TN: Word Pub.