  Reid affirms that humans have diachronic personal identity, and denies Hume's so-called ‘bundle theory’. Reid asserts the relation between memory and personal identity in the second of his first principles dealing with these issues: “Another first principle is our own personal identity and continued existence, as far back as we remember anything distinctly. This we know immediately, and not by reasoning. It seems, indeed, to be a part of the testimony of memory” (EIP 6.5, 476). (See 1.1 Common Sense and First Principles above for discussion of Reid's first principles.)