• It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations.

    "The Value of Science". Public address at the National Academy of Sciences, published in "What Do You Care What Other People Think" (1988), Autumn 1955.
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