I think about the article above, as we know complete is belonging to God. We must aware it, humans can't be complete and always say etc, so on or anything, it's not mean they don't know but if they want to remember it, it's so many. Maybe they can say twice of that word. And their mind will think again and think so far until they never want to say they are forget.
But it's okay, because of it , we know that only God can do it.