Suppose someone asked me, when I see a man in blue uniform going down the street leaving little paper packets at each house, why I suppose that they contain letters? I should reply, “Because whenever he leaves a similar little packet for me I find it does contain a letter.” And if he then objected—“But you’ve never seen all these letters which you think the other people are getting,” I should say, “Of course not, and I shouldn’t expect to, because they’re not addressed to me. I’m explaining the packets I’m not allowed to open by the ones I am allowed to open.” It is the same about this
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