If you want a vision of the future, imagine a boot stamping on a human face — forever. - George Orwell

A scrupulous writer, in every sentence that he writes, will ask himself at least four questions, thus:

1. What am I trying to say?
2. What words will express it?
3. What image or idiom will make it clearer?
4. Is this image fresh enough to have an effect?

And he will probably ask himself two more:
1. Could I put it more shortly?
2. Have I said anything that is avoidably ugly?

But you are not obliged to go to all this trouble. You can shirk it by simply throwing your mind open and letting the ready-made phrases come crowding in. They will construct your sentences for you — even think your thoughts for you, to a certain extent — and at need they will perform the important service of partially concealing your meaning even from yourself.

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.

Never use a metaphor, simile, or other figure of speech which you are used to seeing in print. Never use a long word where a short one will do. If it is possible to cut a word out, always cut it out. Never use the passive voice where you can use the active. Never use a foreign phrase, a scientific word, or a jargon word if you can think of an everyday English equivalent. Break any of these rules sooner than say anything outright barbarous.