"The purpose of Newspeak was not only to provide a medium of expression for the world-view and mental habits proper to the devotees of Ingsoc, but to make all other modes of thought impossible."

The whole climate of thought will be different

"Thoughtcrime does not entail death: thoughtcrime is death."
- George Orwell, 1984, Book 1, Chapter 2

"Don't you see that the whole aim of Newspeak is to narrow the range of thought?... Has it ever occurred to your, Winston, that by the year 2050, at the very latest, not a single human being will be alive who could understand such a conversation as we are having now?... The whole climate of thought will be different. In fact, there will be no thought, as we understand it now. Orthodoxy means not thinking—not needing to think. Orthodoxy is unconsciousness."
- George Orwell, 1984, Book 1, Chapter 5

"It was terribly dangerous to let your thoughts wander when you were in any public place or within range of a telescreen. The smallest thing could igve you away. A nervous tic, an unconscious look of anxiety, a habit of muttering to yourself—anything that carried with it the suggestion of abnormality, of having something to hide. In any case, to wear an improper expression on your face… was itself a punishable offense. There was even a word for it in Newspeak: facecrime..."
- George Orwell, 1984, Book 1, Chapter 5