“I'm asking you to believe. Not in my ability to bring about change - but in yours. I am asking you to hold fast to that faith written into our founding documents; that idea whispered by slaves and abolitionists; that spirit sung by immigrants and homesteaders and those who marched for justice; that creed reaffirmed by those who planted flags from foreign battlefields to the surface of the moon; a creed at the core of every American whose story is not yet written: Yes, we can. Yes, we did. Yes, we can.”

2008, Yes, we can speech (January 2008)

2008, Election victory speech (November 2008)

Remarks to the National Council of La Raza (25 July 2011) http://www.whitehouse.gov/the-press-office/2011/07/25/remarks-president-national-council-la-raza
2011

2013, "Let Freedom Ring" Ceremony (August 2013)
Context: p>Everyone who realizes what those glorious patriots knew on that day -- that change does not come from Washington, but to Washington; that change has always been built on our willingness, We The People, to take on the mantle of citizenship -- you are marching.And that’s the lesson of our past. That's the promise of tomorrow -- that in the face of impossible odds, people who love their country can change it. That when millions of Americans of every race and every region, every faith and every station, can join together in a spirit of brotherhood, then those mountains will be made low, and those rough places will be made plain, and those crooked places, they straighten out towards grace, and we will vindicate the faith of those who sacrificed so much and live up to the true meaning of our creed, as one nation, under God, indivisible, with liberty and justice for all.</p

Fiction, Napoleon Symphony (1974)

2010s, Farewell Speech (2017)
Context: If your family doesn't have much money, I want you to remember that in this country, plenty of folks, including me and my husband — we started out with very little. But with a lot of hard work and a good education, anything is possible — even becoming President. That's what the American Dream is all about.
If you are a person of faith, know that religious diversity is a great American tradition, too. In fact, that's why people first came to this country — to worship freely. And whether you are Muslim, Christian, Jewish, Hindu, Sikh — these religions are teaching our young people about justice, and compassion, and honesty. So I want our young people to continue to learn and practice those values with pride. You see, our glorious diversity — our diversities of faiths and colors and creeds — that is not a threat to who we are, it makes us who we are.

What Happened To Goodbye (2011)
Source: What Happened to Goodbye

"In the long history of the world, only a few generations have been granted the role of defending freedom in its hour of maximum danger. I do not shrink from this responsibility — I welcome it." is one of seven quotes inscribed on the walls at the gravesite of John F. Kennedy at Arlington National Cemetery.
"The energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it — and the glow from that fire can truly light the world." is one of seven quotes inscribed on the walls at the gravesite of John F. Kennedy at Arlington National Cemetery.
"And so, my fellow Americans: ask not what your country can do for you — ask what you can do for your country. My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man." is one of seven quotes inscribed on the walls at the gravesite of John F. Kennedy at Arlington National Cemetery.
It has been reported at various places on the internet that in JFK's Inaugural address, the famous line "Ask not what your country can do for you, ask what you can do for your country", was inspired by, or even a direct quotation of the famous and much esteemed writer and poet Khalil Gibran. Gibran in 1925 wrote in Arabic a line that has been translated as:
::Are you a politician asking what your country can do for you or a zealous one asking what you can do for your country?
::If you are the first, then you are a parasite; if the second, then you are an oasis in a desert.
However, this translation of Gibran is one that occurred over a decade after Kennedy's 1961 speech, appearing in A Third Treasury of Kahlil Gibran (1975) edited by Andrew Dib Sherfan, and the translator most likely drew upon Kennedy's famous words in expressing Gibran's prior ideas. For a further discussion regarding the quote see here.
1961, Inaugural Address
Context: In the long history of the world, only a few generations have been granted the role of defending freedom in its hour of maximum danger. I do not shrink from this responsibility — I welcome it. I do not believe that any of us would exchange places with any other people or any other generation. The energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it — and the glow from that fire can truly light the world.
And so, my fellow Americans: ask not what your country can do for you — ask what you can do for your country.
My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man.

Pink Moon
Pink Moon (1972)