Much has been made of his later mysticism. I can’t speak with firsthand knowledge of everything he might have believed, partly because it seemed to keep changing and partly because it was often difficult to know when he was kidding and when he was serious. My main impression from a number of conversations, though, was that he played at theology the way other people might play at chess problems, that he liked asking the classic science fiction writer’s question—”What if?”—of anything he came across in the way of religious and philosophical notions. It was obviously a dimension of his work, and I’ve often wondered where another ten years would have taken his thinking. Impossible to guess now, really.

I recall that, like James Blish, he was fascinated by the problem of evil, and its juxtaposition with the sometime sweetness of life. I’m sure he wouldn’t mind my quoting from the last letter I received from him (dated 10 April 1981):

Two items were presented to me for my inspection within a period of fifteen minutes: first, a copy of WIND IN THE WILLOWS, which I had never read… A moment after I looked it over someone showed me a two-page photograph in the current Time of the attempted assassination of the President. There the wounded, there the Secret Service man with the Uzi machine gun, there all of them on the assassin. My brain had to try to correlate WIND IN THE WILLOWS and that photograph. It could not. It never will be able to. I brought the Grahame book home and sat reading it while they tried to get the Columbia to lift off, in vain, as you know.