Full Idea
One would think it really self-evident that consciousness of personal identity presupposes, and therefore cannot constitute, personal identity, any more than knowledge can presuppose truth, which it presupposes.
Gist of Idea
Consciousness presupposes personal identity, so it cannot constitute it
Source
Joseph Butler (Analogy of Religion [1736], App.1)
A Reaction
It rather begs the question to dogmatically assert that mere consciousness presupposes a self, especially after Hume's criticisms. That consciousness implies a subject to experience needs arguing for. Is it the best explanation?
Book Reference
'Personal Identity', ed/tr. Perry,John [University of California 1975], p.100