"You ask, can someone with dementia sin? Of course they can! In the early stages of dementia people are still cognizant of their actions and responsible for what they do. They are able to repent, confess and ask for forgiveness. However, I believe that there comes a time in the latter stages when they have little concept of where they are and what they are doing. Suppose that one in the last stages of dementia picks up a knife in anger and stabs someone—and within minutes the act is entirely forgotten. Their behavior is certainly sinful. However, it is not possible for that demented one to deal appropriately with the consequences—including confession and repentance in order to receive forgiveness.
In this case I can’t imagine that God would hold this sin against the demented one. God’s grace, mercy and forgiveness will surely be forthcoming. Now, let’s be clear that no one goes to Heaven based on whether or not they have unforgiven sin when they die. When we received Christ all of our sins were forever forgiven. Nothing we can do in the future can take away salvation—whether we lose our minds or not (Read Romans 8:28-39). Those in the final stages can certainly commit sinful acts. But, it matters little whether or not they ask for forgiveness. According to the Bible, the blood Jesus shed on the cross covers all of our sin." -Dr. Roger Barrier
Here are 10 things you should know about dementia from Dr. John Dunlop:
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