What does it mean that God is light?

The notion that God is light, as stated in 1 John 1:5, signifies His absolute purity, holiness, and truth. In Him, there is no darkness at all, which implies that He cannot tolerate sin or falsehood. This portrayal underscores the nature of God as the source of moral and spiritual illumination, guiding His people away from sin towards truth and righteousness. Understanding God as light compels Christians to reflect His light in their lives, which includes living in truth and striving for holiness, as they walk in relationship with Him and one another.