Always Quotes (page 404)
The means of defence agst. foreign danger, have been always the instruments of tyranny at home. Among the Romans it was a standing maxim to excite a war, whenever a revolt was apprehended. Throughout all Europe, the armies kept up under the pretext of defending, have enslaved the people.
James Madison
I am never forget the day I first meet the great Lobachevsky. In one word he told me secret of success in mathematics: Plagiarize! Plagiarize! Let no one else's work evade your eyes! Remember why the good Lord made your eyes! So don't shade your eyes, But plagiarize, plagiarize, plagiarize -Only be sure always to call it please 'research'.
Tom Lehrer

You do not seek to kill me, Dumbledore?” called Voldemort, his scarlet eyes narrowed. “Above such brutality, are you?”
“We both know that there are other ways of destroying a man, Tom,” Dumbledore said calmly. “Merely taking your life would not satisfy me, I admit —”
“There is nothing worse than death, Dumbledore!” snarled Voldemort.
“You are quite wrong,” said Dumbledore, speaking as lightly as though they were discussing the matter over drinks. “Indeed, your failure to understand that there...
J. K. Rowling
The corruption of the good by the belief in their own infallible goodnes is the most bloody dangerous pitfall in the human spectrum. Once you have conquered all your sins, pride is the one which will conquer you. A man starts off deciding he is a good man because he makes good decisions. Next thing, he's convinced that whatever decision he makes must be good because he's a good man. Most of the wars in the world are caused by people who think they have god on their side. Always stick with...
Helen Fielding
Poetical feelings are a peril to scholarship. There are always poetical people ready to protest that a corrupt line is exquisite. Exquisite to whom? The Romans were foreigners writing for foreigners two millenniums ago; and for people whose gods we find quaint, whose savagery we abominate, whose private habits we don't like to talk about, but whose idea of what is exquisite is, we flatter ourselves, mysteriously identical to ours.
Tom Stoppard