This is a multi-page link that contains a collection of, how you say, controversial quotes from several famous authors, ranging from Tacitus to Voltaire, from Bertrand Russel to Thomas Jefferson. Timely and still relevant (with leaning towards anti-war sentiment), I'm hard pressed to pick a favorite from this list, though I may start with these:
"I distrust those people who know so well what God wants them to do because I notice it always coincides with their own desires." ~ Susan B. Anthony
"The fascist state is the corporate state." ~ Benito Mussolini
"A casual stroll through the lunatic asylum shows that faith does not prove anything." ~ Nietzsche
"I don't know that atheists should be considered citizens, nor should they be considered patriots. This is one nation under God." ~ President George Bush, August 27, 1988
"None are more hopelessly enslaved than those who falsely believe they are free." ~ Johann Wolfgang von Goethe
"All Bibles are man-made." ~ Thomas Edison
"Reality is that which, when you stop believing in it, doesn't go away." ~ Philip K. Dick
"It is hard to free fools from chains they revere." ~ Voltaire
"In a time of universal deceit, telling the truth is a revolutionary act." ~ George Orwell
"Simplicity is the ultimate sophistication." ~ Leonardo da Vinci
Interestingly enough, this link to "Dream Slaughter", refreshes in the browser every 5 seconds with a new quote from this list also.