“For us, it is not who you are, who your family is or where you come from that matters. It is what you are and what you can do for our country that counts.”

Original: Nella vita ciò che conta è su chi puoi contare.
Source: prevale.net

2012, Yangon University Speech (November 2012)

Investment Gurus: A Road Map to Wealth from the World's Best Money Managers. 1999

Interview to Cosmopolitan (2016)

"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.

2015, Address to the Nation by the President on San Bernardino (December 2015)
Context: My fellow Americans, I am confident we will succeed in this mission because we are on the right side of history. We were founded upon a belief in human dignity -- that no matter who you are, or where you come from, or what you look like, or what religion you practice, you are equal in the eyes of God and equal in the eyes of the law. Even in this political season, even as we properly debate what steps I and future Presidents must take to keep our country safe, let’s make sure we never forget what makes us exceptional. Let’s not forget that freedom is more powerful than fear; that we have always met challenges -- whether war or depression, natural disasters or terrorist attacks -- by coming together around our common ideals as one nation, as one people. So long as we stay true to that tradition, I have no doubt America will prevail.

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LXXVII: On Taking One’s Own Life