At the time I wrote about the transubstantiation model of the state I had forgotten Orwells very similar description of doublethink:
The power of holding two contradictory beliefs in one’s mind simultaneously, and accepting both of them …. 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 forget, whatever it was necessary to forget, then to draw it back into memory again 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. … 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 as 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. … The process has to be conscious, or it would not be carried out with sufficient precision, but it also has to be unconscious, or it would bring with it a feeling of falsity and hence of guilt ….
I probably did remember the following passage from Rand:
He was doling his sentences out with cautious slowness, balancing himself between word and intonation to hit the right degree of semi clarity. He wanted her to understand, but he did not want her to understand fully, explicitly, down to the root since the essence of that modern language, which he had learned to speak expertly, was never to let oneself or others understand anything down to the root.
Whether Rands description of that modern language was influenced by Orwells account of Newspeak I dont know, just as I dont know whether Orwells Newspeak was influenced in turn by the similar device in Rands Anthem.