“The strength of the alliance on which our security depends is dependent in turn on our willingness to meet our commitments to them.”

1960, Speech at East Los Angeles College Stadium, Los Angeles, California

2013, Fifth State of the Union Address (February 2013)

opening statement to 9/11 Commission http://www.cnn.com/2004/ALLPOLITICS/04/08/rice.transcript/, May 19, 2004.

2000s, 2006, State of the Union (January 2006)

2014, Sixth State of the Union Address (January 2014)
Context: For while our relationship with Afghanistan will change, one thing will not: our resolve that terrorists do not launch attacks against our country. [... ] We have to remain vigilant. But I strongly believe our leadership and our security cannot depend on our outstanding military alone. As commander in chief, I have used force when needed to protect the American people, and I will never hesitate to do so as long as I hold this office. But I will not send our troops into harm's way unless it is truly necessary, nor will I allow our sons and daughters to be mired in open-ended conflicts. We must fight the battles that need to be fought, not those that terrorists prefer from us -- large-scale deployments that drain our strength and may ultimately feed extremism. So even as we actively and aggressively pursue terrorist networks, through more targeted efforts and by building the capacity of our foreign partners, America must move off a permanent war footing. That's why I've imposed prudent limits on the use of drones, for we will not be safer if people abroad believe we strike within their countries without regard for the consequence.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 440.

Scotland in the World Forum (February 4, 2008), Church of Scotland (May 25, 2009)

2016, DNC Address (July 2016)
Context: America is already great. America is already strong. And I promise you, our strength, our greatness, does not depend on Donald Trump. In fact, it doesn’t depend on any one person. And that, in the end, may be the biggest difference in this election — the meaning of our democracy.
Ronald Reagan called America “a shining city on a hill.” Donald Trump calls it “a divided crime scene” that only he can fix. It doesn’t matter to him that illegal immigration and the crime rate are as low as they’ve been in decades — (applause) — because he’s not actually offering any real solutions to those issues. He’s just offering slogans, and he’s offering fear. He’s betting that if he scares enough people, he might score just enough votes to win this election.
And that's another bet that Donald Trump will lose. And the reason he'll lose it is because he’s selling the American people short. We're not a fragile people. We're not a frightful people. Our power doesn’t come from some self-declared savior promising that he alone can restore order as long as we do things his way. We don’t look to be ruled. Our power comes from those immortal declarations first put to paper right here in Philadelphia all those years ago: We hold these truths to be self-evident, that all men are created equal; that We the People, can form a more perfect union.
That's who we are. That’s our birthright — the capacity to shape our own destiny.

Speech to the UN Economic and Social Council, Geneva, Switzerland (9 July 1965)
Context: We travel together, passengers on a little spaceship, dependent on its vulnerable reserves of air and soil; all committed, for our safety, to its security and peace; preserved from annihilation only by the care, the work and the love we give our fragile craft. We cannot maintain it half fortunate, half miserable, half confident, half despairing, half slave — to the ancient enemies of man — half free in a liberation of resources undreamed of until this day. No craft, no crew can travel safely with such vast contradictions. On their resolution depends the survival of us all.