On January 20, 1961, President John F. Kennedy delivered his inaugural address in which he announced that "we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and success of liberty." The climax of the speech and its most memorable phrase – "Ask not what your country can do for you – ask what you can do for your country" – was honed down from a thought about sacrifice that Kennedy had long held in his mind and had expressed in various ways in campaign speeches.

Source: National Archives