This list is not comprehensive and certainly subject to changes and additions:

• "People should not be afraid of their governments. Governments should be afraid of their people." --V, from the film V for Vendetta.
• "Yield to temptation. It may not pass your way again."--Lazarus Long, in Robert A. Heinlein's Time Enough For Love.
• "When any government. . .undertakes to say to its subjects, 'This you may not read, this you must not see, this you are forbidden to know,' the end result is tyranny and oppression, not matter how holy the motives." --Robert A. Heinlein, from his short novel "If This Goes On."
• "I have always imagined that Paradise will be a kind of library." -- Jorge Luis Borges.
• "Success in war depends upon the golden rule of war. Speed--Simplicity--Boldness." --Gen. George S. Patton, Jr., inscribed in his field notebook.
• "El hombre por mas valiente que sea tiene miedo a una sola cosa: a los pendejos" --Facundo Cabral.
• "There are worse crimes than burning books. One of them is not reading them." --Ray Bradbury.
• "When it shall be said in any country in the world, my poor are happy; neither ignorance nor distress is to be found among them; my jails are empty of prisoners, my streets of beggars; the aged are not in want, the taxes are not oppressive; the rational world is my friend, because I am the friend of its happiness: when these things can be said, then may that country boast of its constitution and government." --Thomas Paine, The Rights of Man.
• "There is good and there is evil, and evil must be punished. Even in the face of Armageddon I shall not compromise in this." --Rorschach, from the graphic novel Watchmen.
• "Information is as lethal as bullets or bombs." --Paul McMasters, of The Freedom Forum.
• [after a hail of gunfire doesn't stop V]
  • Creedy: "Die! Die! Why won't you die?... Why won't you die?"
  • V: "Beneath this mask there is more than flesh. Beneath this mask there is an idea, Mr. Creedy, and ideas are bulletproof." --from the film V for Vendetta
• "My kind of trouble doesn't take vacations." --J.J.McQuade, from the film Lone Wolf McQuade
• "Once you realize what a joke everything is, being the Comedian is the only thing that makes sense." --The Comedian, from the graphic novel Watchmen.
• "Those who can make you believe absurdities can make you commit atrocities." --Voltaire
• "A book worth banning is a book worth reading"
• "Merciless criticism and independent thinking are the two necessary traits of revolutionary thinking." --Bhagat Singh, Indian Independence Leader and Freedom Fighter.
• "I have never killed a man, but I have read many obituaries with great pleasure." —Clarence Darrow (1857–1938)
• “The only foes that threaten America are the enemies at home, and these are ignorance, superstition and incompetence.” --Elbert Hubbard
• "The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little." --Franklin Delano Roosevelt, in his Second Inaugural Address.
• "Properly read, the Bible is the most potent force for atheism ever conceived." --Isaac Asimov, in 1966 (quoted in Yours, Isaac Asimov, p. 316).
• "A person is smart. People are dumb, panicky, dangerous animals, and you know it." --Agent K, from the film Men in Black.
• "Perhaps it’s worth saying again: One reader’s discomfort should never stand in the way of another reader’s survival." --Scott Westerfeld.
• "Only Atheists have morals, the religious have reward and punishment. That's not morality, that's sucking up." --Penn Jillette
• “The problem is that the people with the most ridiculous ideas are always the people who are most certain of them.” --Bill Maher
• A good quote about planning ahead: "A lot of holes in the desert, and a lot of problems are buried in those holes. But you gotta do it right. I mean, you gotta have the hole already dug before you show up with a package in the trunk. Otherwise, you're talking about a half-hour to forty-five minutes worth of digging. And who knows who's gonna come along in that time? Pretty soon, you gotta dig a few more holes. You could be there all fuckin' night." --Nicky Santoro, from the film Casino.
• “To the last, I grapple with thee; From Hell's heart, I stab at thee; For hate's sake, I spit my last breath at thee” --Captain Ahab, in Herman Melville's novel Moby Dick.
• "Sometimes it's to your advantage for people to think you're crazy." --Thelonious Monk.
• "We cannot seek achievement for ourselves and forget about progress and prosperity for our community... Our ambitions must be broad enough to include the aspirations and needs of others, for their sakes and for our own." --Cesar Estrada Chavez
• "Grant me the serenity to accept the things I cannot change, the courage to change the things I cannot accept, and the wisdom to hide the bodies of those I had to kill today because they got on my nerves." --seen on the Web.
• "The liberties of a people never were, nor ever will be, secure, when the transactions of their rulers may be concealed from them." --Patrick Henry
• “Anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that ‘my ignorance is just as good as your knowledge.’” -- Isaac Asimov, in "A Cult of Ignorance," Newsweek (Jan. 21, 1980, pg. 19).
• "There is nobody in this country who got rich on his own. Nobody. You built a factory out there -- good for you. But I want to be clear. You moved your goods to market on the roads the rest of us paid for. You hired workers the rest of us paid to educate. You were safe in your factory because of police forces and fire forces that the rest of us paid for. You didn't have to worry that marauding bands would come and seize everything at your factory... Now look. You built a factory and it turned into something terrific or a great idea -- God Bless! Keep a Big Hunk of it. But part of the underlying social contract is you take a hunk of that and pay forward for the next kid who comes along." -- Elizabeth Warren, Senate Candidate MA
• “Compassion is not weakness, and concern for the unfortunate is not socialism.” --Hubert H. Humphrey
• "When I shut my mouth and turn to walk away, it doesn't mean you've won. It simply means your stupid ass isn't worth any more of my time." --quote seen on the Web