“When I was a Marxist, I did not hold my opinions as a matter of faith but I did have the conviction that a sort of unified field theory might have been discovered. The concept of historical and dialectical materialism was not an absolute and it did not have any supernatural element, but it did have its messianic element in the idea that an ultimate moment might arrive, and it most certainly had its martyrs and saints and doctrinaires and (after a while) its mutually excommunicating rival papacies. It also had its schisms and inquisitions and heresy hunts.”