For, after all, how do we know that two and two make four? Or that the force of gravity works? Or that the past is unchangeable? If both the past and the external world exist only in the mind, and if the mind itself is controllable – what then?

But if thought corrupts language, language can also corrupt thought.

True freedom is the right to say something that others don't want to hear.

I think I exist,' he said wearily. 'I am conscious of my own identity. I was born, and I shall die. I have arms and legs. I occupy a particular point in space. No other solid object can occupy the same point simultaneously.

If publishers and editors exert themselves to keep certain topics out of print, it is not because they are frightened of prosecution but because they are frightened of public opinion. In this country intellectual cowardice is the worst enemy a writer or journalist has to face, and that fact does not seem to me to have had the discussion it deserves.

It's frightful that people who are so ignorant should have so much influence.

During part of 1941 and 1942, when the Luftwaffe was busy in Russia, the German radio regaled its home audience with stories of devastating air raids on London. Now, we are aware that those raids did not happen. But what use would our knowledge be if the Germans conquered Britain? For the purpose of a future historian, did those raids happen, or didn't they? The answer is: If Hitler survives, they happened, and if he falls they didn't happen.