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"Politics and the English Language" (1946)
Source: 1984
Context: But if thought corrupts language, language can also corrupt thought. A bad usage can spread by tradition and imitation even among people who should and do know better.
Context: All issues are political issues, and politics itself is a mass of lies, evasions, folly, hatred, and schizophrenia. When the general atmosphere is bad, language must suffer. I should expect to find — this is a guess which I have not sufficient knowledge to verify — that the German, Russian and Italian languages have all deteriorated in the last ten or fifteen years, as a result of dictatorship.
But if thought corrupts language, language can also corrupt thought. A bad usage can spread by tradition and imitation even among people who should and do know better.

“It was a bright cold day in April, and the clocks were striking thirteen.”

George Orwell book 1984

Source: 1984

“If you want to keep a secret, you must also hide it from yourself.”

George Orwell book 1984

Variant: For the first time he perceived that if you want to keep a secret you must also hide it from yourself.
Source: 1984

“The creatures outside looked from pig to man, and from man to pig, and from pig to man again; but already it was impossible to say which was which.”

George Orwell book Animal Farm

Source: Animal Farm

“Each generation imagines itself to be more intelligent than the one that went before it, and wiser than the one that comes after it.”

George Orwell (1903–1950) English author and journalist

Review of A Coat of Many Colours: Occasional Essays by Herbert Read, Poetry Quarterly (Winter 1945)
Context: Each generation imagines itself to be more intelligent than the one that went before it, and wiser than the one that comes after it. This is an illusion, and one should recognise it as such, but one ought also to stick to one's own world-view, even at the price of seeming old-fashioned: for that world-view springs out of experiences that the younger generation has not had, and to abandon it is to kill one's intellectual roots.

“But it takes a war to make map-reading popular.”

George Orwell (1903–1950) English author and journalist

Source: "As I Please," Tribune (11 February 1944)

“War damages, the fabric of civilisation not by the destruction it causes (the net effect of a war may even be to increase the productive capacity of the world as a whole) nor even by the slaughter of human beings, but by the stimulated hatred and dishonesty.”

George Orwell (1903–1950) English author and journalist

Source: "As I Please," Tribune (4 August 1944)
http://alexpeak.com/twr/orwell/quotes/

“For the dreadful thing about the kind of brutalities here described, is that they are quite unavoidable. When a subject population rises in revolt you have got to suppress it, and you can only do so by methods which make nonsense of any claim for the superiority of western civilisation. In order to rule over barbarians, you have got to become a barbarian yourself.”

George Orwell (1903–1950) English author and journalist

Source: Review of Zest for Life by Johann Wöller, in Time and Tide (17 October 1936)

“To the well-fed it seems cowardly to complain of tight boots, because the well-fed live in a different world-a world where, if your boots are tight, you can change them; their minds are not warped by petty discomfort. But below a certain income the petty crowds the large out of existence; one's preoccupation is not with art or religion, but with bad food, hard beds, drudgery and the sack. Serenity is impossible to a poor man in a cold country and even his active thoughts will go in more or less sterile complaint.”

George Orwell (1903–1950) English author and journalist

Source: Review of Hunger and Love by Lionel Britton, in The Adelphi (April 1931)