I thought his lack of curiosity must be monumental, but I was wrong. It turned out that he had some queer notions about the morality of the whole process, ideas he had gotten from some weirdly aberrant religion in his childhood. I had heard of the cult, as you can hardly avoid it if you know any history. It had said little about ethics, being more interested in arbitrary regulations.

"Picnic on Nearside", in Peter Crowther ed. Tales in Space, p. 286