 Both the contextualist and the Moorean responses to  BKCA,  as discussed in the previous section, leave out one important detail. Both say that one can know that one isn’t a BIV (though contextualists grant this point only for the sense of “know” operational in low-standards contexts), but neither view explains how one can know such a thing. If, by hypothesis, a BIV has all the same states of mind that I have—including all the same perceptual experiences—then how can I be justified in believing that I’m not a BIV? And if I can’t be justified in believing that I’m not a BIV, then how can I know that I’m not?