There had been many times when man had been forced to adopt the only right opinion. Each time man's forward thrust had slackened, vegetated, and died. Once, through the dark ages, the period had lasted almost a thousand years. (Mark Clifton)

There had been many times when man had been forced to adopt the only right opinion. Each time man's forward thrust had slackened, vegetated, and died. Once, through the dark ages, the period had lasted almost a thousand years.

Mark Clifton

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almost dark forward man once opinion period right thousand thrust times time years

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