"If you travel as much as I do - 165,000 miles last year - you exist nowhere. You're always between heaven and earth, you're always arriving in a new place, you're always starting from the beginning - talk about origins - and you don't know quite what's going to unfold. You live in the unexpected and the inexplicable all the time."

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In arriving at the relevant theory about the specifics of our faculty of vision we will presumably use our eyes to gather relevant data. Based on such data we come to know about the optic nerve, the structure of our eyes, the rods and cones, etc., so as to explain how it is that vision gives us reliable access to the shapes and colors of objects around us. In reliably arriving at that theory we thus exercise the very faculty whose reliability is explained by the theory. There is no vice in this sort of circularity.

— Ernest Sosa