“And so our tutorials descended, from the metaphysical to the merely physical... not so much down to earth as down to the carpet, do you remember?

That was the year of 'The Concept of Knowledge', your masterpiece, and the last decent title left after Ryle bagged 'The Concept of Mind' and Archie bagged 'The Problem of Mind' and Ayer bagged 'The Problem of Knowledge' - and 'The Concept of Knowledge' might have made you if you had written it, but we were still on the carpet when an American with an Italian name working in Melbourne bagged it for a rather bad book which sold four copies in London, three to unknown purchasers and the fourth to yourself. He'd stolen a march while you were still comparing knowledge in the sense of having-experience-of, with knowledge in the sense of being-acquainted-with, and knowledge in the sense of inferring facts with knowledge in the sense of comprehending truths, and all the time as you got more and more acquainted with, though no more comprehending of, the symbolic patterns on my Persian carpet, it was knowing in the biblical sense of screwing that you were learning about and maybe there's a book in you yet”