At the great white throne judgment, will anyone be able to say 'I never knew'?
No. When they come up before the great white throne, not a single person will ever say, "Well, I never knew." Everything has been paid for in full, and they will realize it when they are sent out into their eternal doom.
Les makes it plain that at the great white throne there is no plea of ignorance left. As he puts it, when they come up before that throne there isn't a single person that will ever say, "Well, I never knew." The reason is that everything has been paid for in full, and they are going to realize it when they get out into their eternal doom. So there is no room for anyone to claim they were never told or never knew; the knowledge is theirs, and the payment made on their behalf is fully known to them at that point.