To erase the line between man and machine is to obscure the line between men and gods.
The trouble with the question ‘Is it possible for a machine to think?’ is not really that we don’t yet know a machine which could do the job. The question is not analogous to that which someone might have asked a hundred years ago: ‘Can a machine liquefy a gas?’ The trouble is rather the sentence, ‘A machine thinks (perceives, wishes)’ seems somehow nonsensical. It is as though we had asked ‘Has the number 3 a colour?’ (What colour could it be, as it obviously has none of the colours known to us?)
– Ludwig Wittgenstein, Blue Books (1933-1934)