God is Light

" 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. If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth; 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. If we say that we have no sin, we are deceiving ourselves and the truth is not in us. If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness. If we say that we have not sinned, we make Him a liar and His word is not in us." (1 John 1:5-10, NASB95)

If God is Light then we need to walk in the Light. If there is no darkness at all in God, then we need avoid the darkness. The Light that John is talking about here is truth. If we walk in truth we will be in the Light and the Light will be in us and the “blood of Jesus” will “cleanses us from all sin”. We need to be honest with ourselves and confess our sins, when we do He will forgive us and cleanse us from all unrighteousness. God’s Light shines on us and exposes to us our sin.
We need to:
Avoid walking in darkness
Walk in the Light of Truth
Admit our sins