According to the novel, doublethink is:
|“||The power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them . . . . To tell deliberate lies while genuinely believing in them, to forget any fact that has become inconvenient, and then, when it becomes necessary again, to draw it back from oblivion for just so long as it is needed, to deny the existence of objective reality and all the while to take account of the reality which one denies — all this is indispensably necessary. Even in using the word doublethink it is necessary to exercise doublethink. For by using the word one admits that one is tampering with reality; by a fresh act of doublethink one erases this knowledge; and so on indefinitely, with the lie always one leap ahead of the truth.||”|
Another quotation from the novel, when Winston starts thinking about doublethink while exercising:
|“||His mind slid away into the labyrinthine world of doublethink. To know and not to know, to be conscious of complete truthfulness while telling carefully-constructed lies, to hold simultaneously two opinions which cancelled out, knowing them to be contradictory and believing in both of them; to use logic against logic, to repudiate morality while laying claim to it, to believe that democracy was impossible and that the Party was the guardian of democracy; to forget whatever it was necessary to forget, then to draw it back at the moment when it was needed, and then promptly to forget it again: and above all, to apply the same process to the process itself. That was the ultimate subtlety: consciously to induce unconsciousness, and then, once again, to become unconscious of the act of hypnosis you had just performed. Even to understand the word 'doublethink' involved using doublethink.||”|
Orwell explains that the Party could not protect its iron power without degrading its people with constant propaganda. Yet, knowledge of this brutal deception, even within the Inner Party itself, could lead to disgusted collapse of the State from within. For this reason, the government uses a complex system of reality control. Though Nineteen Eighty-Four is most famous for the Party's pervasive surveillance of everyday life, reality control means that the population of Oceania — all of it, including the ruling élite — could be controlled and manipulated merely through the alteration of everyday thought and language. Newspeak is the method for controlling thought through language; doublethink is the method of directly controlling thought.
Newspeak incorporated doublethink, as it contains many words that create assumed associations, between contradictory meanings, especially true of fundamentally important words, such as good and evil; right and wrong; truth and falsehood; justice and injustice.
Doublethink is a form of trained, willful intellectual blindness to contradictions in a belief system. Doublethink differs from ordinary hypocrisy in that the "doublethinking" person deliberately had to forget the contradiction between his two opposing beliefs — and then deliberately forget that he had forgotten the contradiction. He then had to forget the forgetting of the forgetting, and so on; this intentional forgetting, once begun, continues indefinitely. In the novel's notes, Orwell describes it as "controlled insanity".
In the case of workers at the Records Department in the Ministry of Truth, doublethink means being able to falsify public records, and then believe in the new history that they, themselves, had just written. As revealed in Goldstein's Book, the Ministry's name is itself an example of doublethink: the Ministry of Truth is really concerned with lies.
Moreover, doublethink's self-deception allows the Party to maintain huge goals and realistic expectations: If one is to rule, and to continue ruling, one must be able to dislocate the sense of reality. For the secret of rulership is to combine a belief in one's own infallibility with the power to learn from past mistakes. Thus, each Party member could be a credulous pawn, but would never lack relevant information. The Party is both fanatical and well-informed, thus unlikely either to "ossify" or "grow soft" and collapse. Doublethink would avoid a "killing the messenger" attitude that could disturb the Command structure. Thus, doublethink is the key tool of self-discipline for the Party, complementing the state-imposed discipline of propaganda, and the police state. Together, these tools hid the government's evil not just from the people, but from the government itself, but without the confusion and misinformation associated with primitive totalitarian regimes.
Doublethink is critical in allowing the Party to know what its true goals are without recoiling from them, avoiding the conflation of a regime's egalitarian propaganda with its true purpose.
Since Nineteen Eighty-Four was published in 1949, the word doublethink became synonymous with relieving cognitive dissonance by ignoring the contradiction between two worldviews. Some schools of psychotherapy, such as cognitive therapy, encourage people to alter their own thoughts as a way of treating different psychological maladies, (see cognitive distortions).
The following quote by F. Scott Fitzgerald, who died prior to the publication of 1984, rings curious in the context of Orwellian doublethink:
- “The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.” 
- ↑ 1.0 1.1 Orwell, George (1949). Nineteen Eighty-Four. Martin Secker & Warburg Ltd, London, pp 35, 176-177
- Big Lie
- Cognitive dissonance
- List of Newspeak words
- One-Dimensional Man
- Straight and Crooked Thinking (book)
- Two plus two make five
- "From 1984 to One-Dimensional Man.." by Douglas Kellner
- Bloomsburg University "Project 1 Doublethink"
- Commentary by Karen von Hardenberg of The Trincoll Journal