"If we walk in the light, as He is in the light, we have fellowship one with another, and the blood of Jesus Christ His Son cleanseth us from all sin" - 1 John 1:7
"If we walk in the light." It is where we walk, not how. Believers are repentant sinners who have been brought out of darkness into the marvelous light of God's presence (Col. 1:13), and there they walk. The light shines from the mercy-seat in the holiest of all. The vale is rent, so the light is no longer hidden. God is now in the light, and those who honestly face their sins before Him are in the light with Him. This might naturally move the soul to fear of judgment, but "the blood of Jesus Christ His Son" is sprinkled on the mercy seat! This tells us that every righteous demand of the throne of God has been met in the work of the cross. So the believer rests in that which has satisfied God, knowing that the blood "cleanseth...from all (or every) sin." The blood abides in all its cleansing efficacy, and ever answers to God for us. - H.A. Ironside.
I heard the voice of Jesus say, I am this dark world's light;
Look unto Me, thy morn shall rise, and all thy day be bright.
I looked to Jesus, and I found In Him my Star, my Sun;
And in that light of life I'll walk Till trav'ling days are done. - Horatius Bonar