"Pritkin gave me a little shake and I eyed him without favor. The only other occasions when I had been dragged back in time, the trip had been triggered by proximity to a person whose past was being threatened. I have to tell you,” I said frankly, “if someone is trying to mess with your conception or something, I’m not feeling a pressing need to intervene."

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I expressed skepticism, in the first chapter, about the utility of time machines in historical research. I especially advised against graduate students relying on them, because of the limited perspective you tend to get from being plunked down in some particular part of the past, and the danger of not getting back in time for your orals.

— John Lewis Gaddis