If scientific discovery has not been an unalloyed blessing, if it has conferred on mankind the power not only to create but also to annihilate, it has at the same time provided humanity with a supreme challenge and a supreme testing
John F. KennedyPersons are judged to be great because of the positive qualities they possess, not because of the absence of faults.
John F. KennedyThe world has been close to war before - but now man, who has survived all previous threats to his existence, has taken into his mortal hands the power to exterminate the entire species some seven times over.
John F. KennedyMalthus argued a century and a half ago that man, by using up all his available resources, would forever press on the limits of subsistence, thus condemning humanity to an indefinite future of misery and poverty. We can now begin to hope and, I believe, know that Malthus was expressing not a law of nature, but merely the limitation then of scientific and social wisdom. The truth or falsity of his prediction will depend now, with the tools we have, on our own actions, now and in the years to come.
John F. Kennedy