"This kind of thing is frightening to me, because it often gives me the feeling that the very concept of objective truth is fading out of the world. [...] A British and a German historian would disagree deeply on many things, even on fundamentals, but there would still be that body of, as it were, neutral fact on which neither would seriously challenge the other. It is just this common basis of agreement, with its implication that human beings are all one species of animal, that totalitarianism destroys. Nazi theory indeed specifically denies that such a thing as ‘the truth’ exists. There is, for instance, no such thing as ‘Science’. There is only ‘German Science’, ‘Jewish Science’, etc. The implied objective of this line of thought is a nightmare world in which the Leader, or some ruling clique, controls not only the future but the past. If the Leader says of such and such an event, ‘It never happened’ — well, it never happened. If he says that two and two are five — well, two and two are five. This prospect frightens me much more than bombs — and after our experiences of the last few years that is not a frivolous statement."
January 1, 1970
https://en.wikiquote.org/wiki/George_Orwell