Hitchens once wrote a line that has almost gained the status of philosophical epigram or even scientific dictum: "What can be asserted without evidence can be dismissed without evidence." Although it echoes Wittgenstein's famous injunction regarding the ineffable - "Whereof we cannot speak, therefore we must be silent" - Hitchens's version is less a "no entry" sign than a civic reminder to place rubbish in the bin.
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Christopher Hitchens: 'You have to choose your future regrets'.