To be able to always lie outwardly, he has to know the truth for himself, so his inner opinion is the truth.
Does it? Imagine an island filled with two groups of people: one group that believes only true statements, and another group that believes only false statements. Even if both groups tried to always be truthful, the first group would only utter true statements and the second group would only utter false statements. How would you tell whether you were on an island with these groups of people, or on an island with knights and knaves?
If you haven’t read it, you should check out Raymond Smullyan’s book called “What is the Name of this Book?”. It’s the source of knight and knave riddles, and it’s amazing.
If both know of the truth, but are still acting differently, this must be on purpose. So in other words, one wants to harm you and the other not.
Right. The knights want to harm you, and the knaves want to help you. Sadly, both groups were cursed by a witch to forever tell the truth or lie. A knight regrets every statement they make—they want to lead you astray, but are compelled to tell you the truth instead. And a knave also regrets every statement they make—they want to point you in the right direction, but are compelled to lie instead. Their only consolation is that, even by lying, they are revealing information, and they hope that you’re clever enough to figure it out.
Does it? Imagine an island filled with two groups of people: one group that believes only true statements, and another group that believes only false statements. Even if both groups tried to always be truthful, the first group would only utter true statements and the second group would only utter false statements. How would you tell whether you were on an island with these groups of people, or on an island with knights and knaves?
If you haven’t read it, you should check out Raymond Smullyan’s book called “What is the Name of this Book?”. It’s the source of knight and knave riddles, and it’s amazing.
Right. The knights want to harm you, and the knaves want to help you. Sadly, both groups were cursed by a witch to forever tell the truth or lie. A knight regrets every statement they make—they want to lead you astray, but are compelled to tell you the truth instead. And a knave also regrets every statement they make—they want to point you in the right direction, but are compelled to lie instead. Their only consolation is that, even by lying, they are revealing information, and they hope that you’re clever enough to figure it out.