"As I fear not a child with a weapon he cannot lift, I will never fear the mind of a man who does not think.’”
Words of Radiance, Brandon Sanderson, page 795
Both the metaphor and its literal application only make sense if "cannot" and "does not" means "never", and they really don't.
While I'd never fear the mind of a man who literally is in a coma and doesnt think at all, I'd have plenty of reason to fear the mind of a man whose ability to think is merely limited. He can be a stupid moral reasoner and a clever killer at the same time.
Another month has passed and here is a new rationality quotes thread. The usual rules are: