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"Epistemological questions opened out of another like the rounds of a turning kaleidoscope, always returning to the same point: I think I know something, but how can I know that I know what I know?"
Apparently this was the headeache inducing way of philosophical thinking before existentialism and phenomenology. I kind of get why people got annoyed by this and invented their own way of thinking, which focuses on the things that are right in front of you.