When a person commits a sin, this is accompanied by darkness. Indeed, disobedience is like a fire, and darkness is its smoke. It is like someone kindling a fire in a room for seventy-years. Do you not think that the roof of that room will be blackened? In the same way the heart is blackened by disobedience. And nothing wipes it clean except repentance to God. Humiliation, darkness, and being veiled from God are thus natural accompaniments of disobedience. But when you repent to God, the effects of these sins disappear.