“Many people – many nations – can find themselves holding, more or less wittingly, that ‘every stranger is an enemy’.

For the most part this conviction lies deep down like some latent infection; it betrays itself only in random, disconnected acts, and does not lie at the base of a system of reason. But when this does come about, when the unspoken dogma becomes the major premiss in a syllogism, then at the end of the chain, there is the concentration camp. Here is the product of a conception of the world carried rigorously to its logical conclusion; so long as the conception subsists, the conclusion remains to threaten us. The story of the death camps should be understood by everyone as a sinister alarm-signal”