“I am the light of the world. Whoever follows me will not walk in darkness, but will have the light of life.” (John 8:12) and “When (or as often as) I am in the world, I am the light of the world” (John 9:5)
If you have the true light, which is Christ Himself (John 1:9), you will not walk in darkness; if you walk in darkness you don’t have the true light. The only way you can have the true light is if you are connected to the source of power; Christ Jesus the Lord. That light was seen in His life; He was described as the “brightness of His glory and the exact representation of His nature” in Hebrews 1:3. If we have that true light, it will also be seen in our lives; after all, “The lamp of the body is the eye: if therefore your eye be single, your whole body shall be full of light” (Matthew 6:22). Therefore, “even so, let your light shine before men” (Matthew 5:16)
The light must lead to a moral reworking if it is the true light; if it does not, then “the light that is in you is darkness” (Matthew 6:23).
If redemption is a moral restoration to the divine image, as it is meant to be, then we may expect God to insist on a moral tuning up every time we slip off into the self life; indeed, we should ask God for it because it will include bringing into harmony the discordant elements within the personality, an adjustment of the soul to God, His will and ultimately His nature.
There is a danger that we will settle for less but the only way that true peace can be found is if the twists and turns within the heart are resolved by complete surrender to the absolute Lordship of Christ. Then all of the parts are brought into right proportion to each other and to the whole, which is God Himself.