What is Doublethink?
1.
"Ashes. Not even identifiable ashes. Dust. It does not exist. It never existed."
"But it did exist! It does exist! It exists in memory. I remember it. You remember it."
"I do not remember it," said O'Brien.
2.
"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 morally 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 draw it back into memory again at the moment when it was needed, and then promptly to forger 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 the use of doublethink."
-1984, George Orwell
3.
When one is forced to express that a lie is truth, despite his knowledge of the real facts. Orgininated in the book 1984 in the fictional Socialist government of
Bobby committed doublethink when he said to his young daughter that she could do anything that she set her mind to it, despite the fact that he knew that was a lie.
(But in the book 1984, doublethink is more of a serious act of course)