And yet all too often, these words are ignored. In some countries, the failure to uphold human rights is excused by the false suggestion that these are Western principles, foreign to local cultures or stages of a nation’s development. And within America, there has long been a tension between those who describe themselves as realists or idealists - a tension that suggests a stark choice between the narrow pursuit of interests or an endless campaign to impose our values.

I reject this choice. I believe that peace is unstable where citizens are denied the right to speak freely or worship as they please; choose their own leaders or assemble without fear. Pent up grievances fester, and the suppression of tribal and religious identity can lead to violence. We also know that the opposite is true. Only when Europe became free did it finally find peace. America has never fought a war against a democracy, and our closest friends are governments that protect the rights of their citizens. No matter how callously defined, neither America’s interests - nor the world’s -are served by the denial of human aspirations.

So even as we respect the unique culture and traditions of different countries, America will always be a voice for those aspirations that are universal. We will bear witness to the quiet dignity of reformers like Aung Sang Suu Kyi; to the bravery of Zimbabweans who cast their ballots in the face of beatings; to the hundreds of thousands who have marched silently through the streets of Iran. It is telling that the leaders of these governments fear the aspirations of their own people more than the power of any other nation. And it is the responsibility of all free people and free nations to make clear to these movements that hope and history are on their side

Let me also say this: the promotion of human rights cannot be about exhortation alone. At times, it must be coupled with painstaking diplomacy. I know that engagement with repressive regimes lacks the satisfying purity of indignation. But I also know that sanctions without outreach - and condemnation without discussion - can carry forward a crippling status quo. No repressive regime can move down a new path unless it has the choice of an open door.

In light of the Cultural Revolution’s horrors, Nixon’s meeting with Mao appeared inexcusable - and yet it surely helped set China on a path where millions of its citizens have been lifted from poverty, and connected to open societies. Pope John Paul’s engagement with Poland created space not just for the Catholic Church, but for labor leaders like Lech Walesa. Ronald Reagan’s efforts on arms control and embrace of perestroika not only improved relations with the Soviet Union, but empowered dissidents throughout Eastern Europe. There is no simple formula here. But we must try as best we can to balance isolation and engagement; pressure and incentives, so that human rights and dignity are advanced over time.

Third, a just peace includes not only civil and political rights - it must encompass economic security and opportunity. For true peace is not just freedom from fear, but freedom from want.

It is undoubtedly true that development rarely takes root without security; it is also true that security does not exist where human beings do not have access to enough food, or clean water, or the medicine they need to survive. It does not exist where children cannot aspire to a decent education or a job that supports a family. The absence of hope can rot a society from within.

And that is why helping farmers feed their own people - or nations educate their children and care for the sick - is not mere charity. It is also why the world must come together to confront climate change. There is little scientific dispute that if we do nothing, we will face more drought, famine and mass displacement that will fuel more conflict for decades. For this reason, it is not merely scientists and activists who call for swift and forceful action - it is military leaders in my country and others who understand that our common security hangs in the balance.

Agreements among nations. Strong institutions. Support for human rights. Investments in development. All of these are vital ingredients in bringing about the evolution that President Kennedy spoke about. And yet, I do not believe that we will have the will, or the staying power, to complete this work without something more - and that is the continued expansion of our moral imagination; an insistence that there is something irreducible that we all share.