"I wonder if it's ever really possible to know the truth about someone else, or if the best we can do is just stumble into each other, heads down, hoping to avoid collision. I...wonder how many people are clutching secrets like little fists, little rocks sitting in the pits of their stomachs. All of them, maybe."

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'In his celebrated book, 'On Liberty', the English philosopher John Stuart Mill argued that silencing an opinion is "a peculiar evil." If the opinion is right, we are robbed of the "opportunity of exchanging error for truth"; and if it's wrong, we are deprived of a deeper understanding of the truth in its "collision with error." If we know only our own side of the argument, we hardly know even that: it becomes stale, soon learned by rote, untested, a pallid and lifeless truth.'

— Carl Sagan