"I saw dawn upon them like the sun a vision of a time when all men walk proudly through the earth and the bombs and missiles lie at the bottom of the ocean like the bones of dinosaurs buried under the shale of eras."

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The fact that no limits exist to the destructiveness of this weapon [the 'Super', i.e. the hydrogen bomb] makes its very existence and the knowledge of its construction a danger to humanity as a whole. It is necessarily an evil thing considered in any light. For these reasons, we believe it important for the President of the United States to tell the American public and the world what we think is wrong on fundamental ethical principles to initiate the development of such a weapon.

— Enrico Fermi