1 John 1:5-7
5 This is the message we have heard from Him and announce to you, that God is Light, and in Him, there is no darkness at all. 6 If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth;
7 but if we walk in the Light as He Himself is in the Light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.
God is absolute holiness, without compromise, negotiation, or accommodation, displayed as light without darkness. Fellowship means an agreement that results in joint participation and if you are going to say you have fellowship with Him, you must be walking in absolute light to the exclusion of darkness. That’s hard because of what it rejects. Darkness very often is attractive because it’s where the cool crowd is hanging out and having all the fun. It’s hard because of what it accepts, embraces, and commits to. It’s easiest to say you are walking in the light yet walk in some amount of darkness because you aren’t so strident and potentially judgmental. But if you try to straddle the fence, combining light with darkness, you’re simply a liar not walking in fellowship with God and not practicing the truth. However, if you walk in the light as God Himself is in the light, you have fellowship with fellow believers and the blood of Jesus constantly cleanses you from all sin.
How is God in the light? Can you do that? If you could be 100% in the light, why would the blood of Jesus need to constantly be cleansing you from sin? Maybe because you want to be 100%, but . . .