According to Reid, memory is neither necessary nor sufficient for personal identity, metaphysically speaking, despite the conceptual and evidential relations memory bears to personal identity. It is not a necessary condition because each us has been agent or witness to many events that we do not now remember. “I may have other good evidence of things which befell me, and which I do not remember: I know who bare me, and suckled me, but I do not remember these events” (Essays, 264). It is not a su