A.:
Well . . . you know that's so difficult to answer because psychohistory originated in a discussion between myself and Campbell, as so many of the things in my early science fiction stories did. And I think Campbell must have been reading about symbolic logic at the time. There is some reference to symbolic logic in the first story and that was more or less forced on me by John Campbell; it didn't come naturally to me, because I knew nothing about symbolic logic. And he felt in our discussion that symbolic logic, further developed, would so clear up the mysteries of the human mind as to leave human actions predictable. The reason human beings are so unpredictable was we didn't really
know what they were saying and thinking because language is generally used obscurely. So what we needed was something that would unobscure the language and leave everything clear. Well, this
I
didn't believe, so I made it mathematical and
my
analogy was, of course, to the kinetic theory of gases, where the individual molecules in the gas remain as unpredictable as ever, but the average action is completely predictable, so that what we needed were two things, a lot of people, which the galactic empire supplied, and secondly, people not knowing what the conclusions were as to the future so that they could continue to act randomly. And that's the way it worked out. Now, when Wollheim says that it was what Marxism pretended to be, well when Wollheim was young he was very interested in Marxism and undoubtedly read a lot about it. I've never read anything about it, you see, so it's a case of his reading his bent into me. For me, it was the kinetic theory of gases and that was secondarily imposed and it was John Campbell who really started it with symbolic logic.