  When Reid says ‘memory is unaccountable’ he means that we don't know why distinct memory is always accompanied by belief; we don't know why it reliably produces true belief; and we can't established that memory beliefs are true in a non-circular fashion (van Woudenberg 2004). Further analysis of the epistemology of memory belief is prevented by virtue of this unaccountability. This insight about the epistemology of memory belief indicates subtlety about the limits of analysis, which has drawn favorable comparisons to Wittgenstein (Wolterstorff 2000, ch. 9).