Regarding personal identity, he rejected Locke's account that self-consciousness in the form of memory of one's experiences was the basis of a person's being identical with their self over time.
Mis puutub personaalsesse identiteeti, lükkas ta ümber Locke’i käsitluse, et eneseteadvus kogemustele tugineva mälu kujul on aluseks sellele, et inimene oleks aja jooksul identne iseendaga.