Pat was feeling ambitious so he wanted to tackle one of the greats: German philosopher & weird virgin Immanuel Kant. Ben explains Kant's whole mission to Pat, which was basically to lay out a comprehensive, scientific theory of how we know things. He did this by reconciling the two competing theories of knowledge at the time: Rationalism vs. Empiricism. This was an insane thing to attempt, even for a huge nerd like Kant, which may explain why he never left his hometown and never, ever got laid. Pat also advances the theory that Kant's weirdness came from having a super hot mom. Who knows?