“Responsibility and leadership in the 21st century demand more. In an era when our destiny is shared, power is no longer a zero sum game. No one nation can or should try to dominate another nation. No world order that elevates one nation or group of people over another will succeed. No balance of power among nations will hold.”

Introduction, p. xxv
The Age of Fallibility (2006)
Context: We must recognize that as the dominant power in the world we have a special responsibility. In addition to protecting our national interests, we must take the leadership in protecting the common interests of humanity. I go into some detail as to what that entails.
Mankind’s power over nature has increased cumulatively while its ability to govern itself has not kept pace. There is no other country that can take the place of the United States in the foreseeable future. If the United States fails to provide the right kind of leadership our civilization may destroy itself. That is the unpleasant reality that confronts us.

1970s, Second Inaugural Address (1973)

Source: The Long Tail: Why the Future of Business Is Selling Less of More (2006), Ch. 2, p. 40

Speech to a joint session of the Dail and the Seanad, Dublin, Ireland (28 June 1963)
1963

Source: Disputed, Hitler: Memoirs of a Confidant (1978), p. 170

Source: Articles, Come September (29 Sep 2002)

Nobel lecture (2001)
Context: Today, in Afghanistan, a girl will be born. Her mother will hold her and feed her, comfort her and care for her — just as any mother would anywhere in the world. In these most basic acts of human nature, humanity knows no divisions. But to be born a girl in today's Afghanistan is to begin life centuries away from the prosperity that one small part of humanity has achieved. It is to live under conditions that many of us in this hall would consider inhuman.
I speak of a girl in Afghanistan, but I might equally well have mentioned a baby boy or girl in Sierra Leone. No one today is unaware of this divide between the world’s rich and poor. No one today can claim ignorance of the cost that this divide imposes on the poor and dispossessed who are no less deserving of human dignity, fundamental freedoms, security, food and education than any of us. The cost, however, is not borne by them alone. Ultimately, it is borne by all of us — North and South, rich and poor, men and women of all races and religions.
Today's real borders are not between nations, but between powerful and powerless, free and fettered, privileged and humiliated. Today, no walls can separate humanitarian or human rights crises in one part of the world from national security crises in another.

2012, Re-election Speech (November 2012)
Context: The role of citizen in our democracy does not end with your vote. America's never been about what can be done for us. It's about what can be done by us together through the hard and frustrating, but necessary work of self-government. That's the principle we were founded on. This country has more wealth than any nation, but that's not what makes us rich. We have the most powerful military in history, but that's not what makes us strong. Our university, our culture are all the envy of the world, but that's not what keeps the world coming to our shores. What makes America exceptional are the bonds that hold together the most diverse nation on earth. The belief that our destiny is shared; that this country only works when we accept certain obligations to one another and to future generations. The freedom which so many Americans have fought for and died for comes with responsibilities as well as rights. And among those are love and charity and duty and patriotism. That's what makes America great.

Employment of Naval Forces (1948)