[The Green Goblin]

There are five degrees of fool in the Proverbs. I think you've hit #5.

"...but whosoever shall say, 'Thou fool', shall be in danger of hell fire." ---Matthew 5:22

[The Red Zone]

"...but whosoever shall say, 'Thou fool', shall be in danger of hell fire." ---Matthew 5:22

Clever... but beside the point. That is talking about accusing someone of being utterly unredeemable.