“One hundred eighty years later, we know that the eyes of the world are fixed upon us. And we must ask ourselves: what kind of an example of freedom do we give to our age? What are the true marks of our America—and what do they mean to the world?”

"1860. In Lodge of Sorrow at Washington: March 30.", p. 11 <!-- [books.google.com/books?id=PTpRwZ1yEWwC&pg=PA11&dq=What+we+have+done+for+ourselves+Albert+Pike&hl=en&sa=X&ei=akWkT_3QCqLA6AHG_7G6CQ&ved=0CDcQ6AEwAA#v=onepage&q=remains immortal&f=false page 11] -->
In sentiment this is similar to the expression made much earlier by Giordano Bruno in On the Infinite Universe and Worlds (1584) : "What you receive from others is a testimony to their virtue; but all that you do for others is the sign and clear indication of your own."
Ex Corde Locutiones: Words from the Heart Spoken of His Dead Brethren
Variant: What we have done for ourselves alone dies with us; what we have done for others and the world remains and is immortal.

Source: Solaris

"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.

Earliest instance of this quote found on google books is the 1989 book Forest primeval: the natural history of an ancient forest by Chris Maser, but there it appears to be Maser's own thought (see p. 230 http://books.google.com/books?id=8EAHQM54E5gC&q=%a+mirror% followed by a different supposed Gandhi quote http://books.google.com/books?id=8EAHQM54E5gC&q=gandhi).
Disputed

2014, Address to European Youth (March 2014)

Source: "The Conduct of Inquiry", p. 43.

14 December 1756
Letters to His Son on the Art of Becoming a Man of the World and a Gentleman (1774)

2000s, Where the Right Went Wrong (2004)

Source: 1890s, The Principles of Psychology (1890), Ch. 10