“ the one unchangeable certainty is that nothing is certain or unchangeable. ”
 John F. Kennedy, State of the Union Address (11 January 1962). copy citation

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“This basic clash of ideas and wills is but one of the forces reshaping our globe—swept as it is by the tides of hope and fear, by crises in the headlines today that become mere footnotes tomorrow. Both the successes and the setbacks of the past year remain on our agenda of unfinished business. For every apparent blessing contains the seeds of danger—every area of trouble gives out a ray of hope—and the one unchangeable certainty is that nothing is certain or unchangeable.
Yet our basic goal remains the same: a peaceful world community of free and independent states—free to choose their own future and their own system, so long as it does not threaten the freedom of others.” source

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