"We lead two lives, and the half of our soul is madness, and half heaven is lit by a black sun. I say I am a man, is the other that hides in me?"

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The young specialist in English Lit, ...lectured me severely on the fact that in every century people have thought they understood the Universe at last, and in every century they were proved to be wrong. It follows that the one thing we can say about our modern "knowledge" is that it is wrong.

— Isaac Asimov