“We'll all turn black
So who's to know?
As a matter of fact,
Color, creed and breed must go.
There will be no light,
So there can be no sight.
And you'll judge your fellow man;
Understand bout what is right.
A million music, a million sound
There's neutral thoughts
For the underground.”

Rome, or Reason? A Reply to Cardinal Manning. Part I. The North American Review (1888)
Context: "Whosoever will be saved, before all things it is necessary that he hold the Catholic faith." It is not necessary, before all things, that he be good, honest, merciful, charitable and just. Creed is more important than conduct. The most important of all things is, that he hold the Catholic faith. There were thousands of years during which it was not necessary to hold that faith, because that faith did not exist; and yet during that time the virtues were just as important as now, just as important as they ever can be. Millions of the noblest of the human race never heard of this creed. Millions of the bravest and best have heard of it, examined, and rejected it. Millions of the most infamous have believed it, and because of their belief, or notwithstanding their belief, have murdered millions of their fellows. We know that men can be, have been, and are just as wicked with it as without it.

Source: The Heart is a Lonely Hunter

Edwards v. California, 314 U.S. 160, 184 (1941)
Judicial opinions

Spider's Web, from Piece By Piece (2005)
Lyrics

"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.

"(What's So Funny 'Bout) Peace, Love, and Understanding" on The New Favourites of Brinsley Schwarz (1974); the song later became a hit as sung by Elvis Costello. ( Nicke Lowe performance http://www.youtube.com/watch?v=P7txCdLCP9U - Elvis Costello & Nick Lowe joint performance http://www.youtube.com/watch?v=dWdh7ERLb3E)
Context: As I walk through
This wicked world
Searchin' for light in the darkness of insanity,
I ask myself
Is all hope lost?
Is there only pain and hatred, and misery? And each time I feel like this inside,
Theres one thing I wanna know:
What's so funny 'bout Peace, Love, and Understanding?

Though Costello's cover became a hit, "(What's So Funny 'Bout) Peace, Love, and Understanding", was actually written by Nick Lowe.
Misattributed
Context: As I walk through
This wicked world
Searchin' for light in the darkness of insanity,
I ask myself
Is all hope lost?
Is there only pain and hatred, and misery?
And each time I feel like this inside,
There's one thing I wanna know:
What's so funny 'bout Peace, Love, & Understanding?

Music, Mind, and Meaning (1981)