Existence

"The Council of Scholars has said that we all know the things which exist and therefore the things which are not known by all do not exist".

I'd say that this statement is driven on a logical fallacy. The logic used here is that if one thing is true, than the opposite must not be true. However, this isn't he case. Elements of the world exist, even if they're not know by man. They are just waiting to be discovered by humanity. Many things in this world haven't been discovered yet, and they're just waiting to cause a revolution in society.

However, the council doesn't want their citizens to know that. The council only wants the citizens to know enough to function in everyday life; nothing more, nothing less. That is how this dystopian society has thrived thus far. Knowledge is power, and in this case, the opposite is, in fact true. The lack of knowledge means the lack of power.