“a single word even may be a spark of inextinguishable thought”

Sir Dinshaw Wacha in Dr. Dadabhai Naoroji: "The Grand Old Man of India"
About Dadabhai

Magnús Sigurðsson
Íslandsklukkan (Iceland's Bell) (1946), Part II: The Fair Maiden

Source: Real Presences (1989), II: The Broken Contract, Ch. 4 (p. 82).

Ideas, p. 23
Catching the Big Fish (2006)
Context: An idea is a thought. It's a thought that holds more than you think it does when you receive it. But in that first moment there is a spark. In a comic strip, if someone gets an idea, a lightbulb goes on. It happens in an instant, just as in life.
It would be great if the entire film came all at once. But it comes, for me, in fragments. That first fragment is like the Rosetta stone. It's the piece of the puzzle that indicates the rest. It's a hopeful puzzle piece.
In Blue Velvet, it was red lips, green lawns, and the song — Bobby Vinton's version of "Blue Velvet". The next thing was an ear lying in a field. And that was it.
You fall in love with the first idea, that little tiny piece. And once you've got it, the rest will come in time.

Peter Agre's speech at the Nobel Banquet http://nobelprize.org/nobel_prizes/chemistry/laureates/2003/agre-speech-e.html, December 10, 2003

Epilogue II, ch. 1 http://www.classicreader.com/book/92/354/
War and Peace (1865–1867; 1869)

Source: The Kite Runner

Winston Churchill, in "The Defence of Freedom and Peace (The Lights are Going Out)", radio broadcast to the United States and to London (16 October 1938).
The 1930s
Context: People say we ought not to allow ourselves to be drawn into a theoretical antagonism between Nazidom and democracy; but the antagonism is here now. It is this very conflict of spiritual and moral ideas which gives the free countries a great part of their strength. You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police. On all sides they are guarded by masses of armed men, cannons, aeroplanes, fortifications, and the like — they boast and vaunt themselves before the world, yet in their hearts there is unspoken fear. They are afraid of words and thoughts; words spoken abroad, thoughts stirring at home — all the more powerful because forbidden — terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic. They make frantic efforts to bar our thoughts and words; they are afraid of the workings of the human mind. Cannons, airplanes, they can manufacture in large quantities; but how are they to quell the natural promptings of human nature, which after all these centuries of trial and progress has inherited a whole armoury of potent and indestructible knowledge?