 I will suppose myself conscious at Forty of having been carried to a Market or Fair at Five Years old, without any Particle of Matter about me, the same which I had at that Age: now in order to retain the Consciousness of that Action, it is necessary to revive the Idea of it before any considerable Flux of Particles, (otherwise I must totally lose the Memory of it (as I do of several things done in my Childhood) and by reviving the Idea of that Action, I imprint afresh the Consciousness of having done that Action, by which the Brain has a lively an Impression of Consciousness (though it be not entirely composed of the same Particles) as it had the day after it did the Action…. (ibid.)