 Returning to an idea of memory, it contains: (1) the idea of a present sensation, (2) the idea of a fainter sensation that is now remembered, (3) the idea of time as a continued existence, and (4) the idea that the present sensation and the remembered sensation are ordered by virtue of being simultaneous with earlier and later moments of time. In addition, it contains (5) the perception of one’s own existence during the interval between the original perception and the present one.  This is nothing other than perception of the continued existence of oneself, i.e., the conjunction of two capacities that constitute the self.  Their continued existence is inferred from the necessity that these standing causes continue to exist when they are not conjoined with the active causes of particular sensations.