“A graduate student sent me a long paper on one book that we know for sure that John Bunyan (author of Pilgrim’s Progress) actually read. It’s called The Plain Man’s Path to Heaven, written by an English Puritan writer called Arthur Dent. He assumed that I was aware of this and was having some extraordinary academic joke. “Once you’ve decided to find parallels you can find them all the time: you can add up numbers, you can compare images… you can pick up any two books and if you wished to prove they were parallel, you could do it. You could pick up the Bible and the telephone directory, and
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