What I'm thinking of is the Münchhausen trilemma.

I never said that. I just said that we rely on perception to decide what is true and what is not. "I know X" is an interpretation that may be right. Every claim of knowledge is an interpretation.

In one way, life makes me a little bit sad because of the philosophical nature of truth and reasoning. All truth and reasoning, whether you like it or not or admit it or not, is based on assumptions that may be true but cannot be proven true outside your blind acceptance. That's just how it is. And since we are known to be wrong about things sometimes, why should I have any faith in what I believe? Haven't you had moments where you thought you knew something but it turned out later to be false?