My POV is that only Christians walk in the light, therefore only Christians can freely admit to sin as a fault in their own behavior, rather than as a fault in their nature, and thus can ruly repent. A Christian walking in the light takes responsibility for his sins, does not deny them or hide them, and works hard to correct them as they are an unacceptable flaw to him, rather than the non-Christian, whose nature leads them to sin, and are thus unwilling or incapable to take personal responsibility for them or correct them and are thus incapable of true repentance unto God.
In my POV those who truly walk in darkness, are those who claim there is no such thing as sin, or that they have no sin and thus deny what the scriptures plainly say. That ALL men but ONE sins and falls short of the glory of God.
My POV requires me to reject sin as a natural part of me and rely on God and His son, Jesus Christ to help me eliminate it from my life, as told to me in the scriptures. My righteousness is not based on my "achievements" to avoid sin, but in my faith that the blood of Jesus cleanses us from all sin.
8 If we say we have no sin, we deceive ourselves, and the truth is not in us.
9 If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
10 If we say we have not sinned, we make him a liar, and his word is not in us.