It is hard to talk to talk to people who believe that truth is relative. And there are more and more such people all the time.
C.S. Lewis described the fallacy of any theory that rejects the connection between thought and truth. In his book Miracles he said “All possible knowledge … depends on the validity of reasoning,” and developed his argument thus:
No account of the universe can be true unless that account leaves it possible for our thinking to be a real insight. A theory which explained everything else in the whole universe but which made it impossible to believe that our thinking was valid would be utterly out of court. For that theory would itself have been reached by thinking, and if thinking is not valid that theory would, of course, itself be demolished. It would have destroyed its own credentials. It would be an argument which…
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