If the representations I can attribute to myself possess a unity of the right kind, then apprehending that unity allows me to represent the apperceiving subject of any one of them as identical with that of any other
The second stage of the argument of §16 highlights another implication of the claim that “the empirical consciousness, which accompanies different representations, is dispersed and without relation to the identity of the subject” (B133): that Hume’s theory lacks the resources to account for my representation-relation to the identity of the subject; that is, this view cannot explain how I can “represent to myself the identity of the consciousness in [i.e. throughout] these representations” (B133)