Last week, we saw that on Bediuzzaman's view, the commission of even major sins is not tantamount to unbelief. This week, we examine a related issue - the status of the person who persists in the commission of a given sin. We consider what it means for such a person's heart to become blackened or stained, and how this blackening can be reconciled with with the above view that sin is not tantamount to a loss of faith. Based on the Second Flash of the Risale-i Nur.