 Some important philosophers have urged that memory-carried diachronic unity is not sufficient for being one person over time. Kant, for example, argued for a dissociation here, in his famous critique of the third paralogism. In Kant’s view, continuity sufficient to “retain the thought of the previous subject and so hand it over to the subsequent subject” (1781: A363), continuity sufficient therefore for diachronic unity of consciousness, is quite compatible with the ‘retained thoughts’ being passed from one subject to another, compatible therefore with an utter absence of personal identity. If so, diachronic unity is not sufficient for personal identity (Brook 1994: ch. 8). (Note: Locke and Kant may be less far apart than this brief discussion would suggest. We are merely using them to illustrate the two positions, not discussing either of them fully.) 