I would agree that Kennedy's inaugural speech strikes a note of optimism and an attempt to pull people together. However, it also is a speech that is best understood in the context of the Cold War.

Kennedy opens with a call to freedom, then moves on to allude to the tensions existing at that time between the United States and the Soviet Union, troubles that could lead to a nuclear war, when he states:

The world is very different now. For man holds in his mortal hands the power to abolish all forms of human poverty and all forms of human life.

He then goes on to allude to the Cold War struggle across the globe to influence countries to become either communist or capitalist. Kennedy states:

Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty.

Kennedy is using liberty and freedom to refer to his commitment towards anti-communist countries embracing free enterprise systems and freedom of speech and religion. Kennedy states in a not-too-veiled way that the nations of the world are being asked to pick sides. He states that any country that chooses the American side in the global struggle for supremacy would be assured of American support; every country that does not can expect the powerful United States to oppose it.

The speech marks a remarkable advance in the United States's thinking about its role in the world in a mere twenty years. It clearly shows that the US has fully adopted the mantle of superpower and leader of the free world, abandoning completely its long isolationist tradition. Kennedy speaks in this address not only to the United States but to the entire in world.

Kennedy radiates idealism as he reaches out to nations across the globe:

To those people in the huts and villages of half the globe struggling to break the bonds of mass misery, we pledge our best efforts to help them help themselves, for whatever period is required--not because the communists may be doing it, not because we seek their votes, but because it is right. If a free society cannot help the many who are poor, it cannot save the few who are rich.

The inaugural address is an important statement to both American citizens and the world about the US's central importance in global affairs. It is still relevant as the US continues to be a world leader, though troubled in recent years and turning more towards an inward-looking nationalism. Nevertheless, we still have the world's largest economy and military, which makes us a very significant force in global affairs.

The quotes highlighted in the first post are probably the best ones to reflect the spirit of optimism and hope that Kennedy was trying to tap into within the American people.  The zeal and exuberance that Kennedy symbolized was brought out in resonant fashion in his Inauguration Speech.  Kennedy was very well skilled at getting the public to constantly believe that he was articulating a vision of what can be or what could be as opposed to what is.  It is this idea that led many to accept that Kennedy's election was a voice of change.  Bringing this out in his speech, Kennedy wanted to chart the course or establish the perception that his administration would work with Americans in redefining the role of America in both the world and in how it sees itself.  Given the rise of the 1960s spirit that was embodied in his election and the belief in his administration, his Inauguration Speech was a great way to strike this chord and set the tone for this belief.

John Fitzgerald Kennedy's eloquent Inaugural Address is considered to be among the best presidential inaugural speeches in history.  Kennedy, the second youngest President ever, stated that "the torch has been passed to a new generation" and suggested the country held the power "to abolish all forms of poverty."  He displayed determination in his speech to defend liberty at any price.

Among the most memorable of his points, Kennedy's placing responsibility upon each citizen was a call to action: 

Ask not what your country can do for you; ask what you can do for your country.

This call to action and individual reponsibility led to the formation of the Peace Corps in which many young people gave of their time to help others around the world.  Other agencies around the country also set about to make America better.

This concept of patriotism and personal responsibility has been shelved by many today. Many people now want a "nanny government" that will take care of them. And, with the influx of some who seek to merely use the benefits of America, there is little asking what they can do for the country. Instead, the mentality is "What can America do for us?"