Full Idea
The objects which are variable or interrupted, and yet are supposed to continue the same, are such only as consist of a succession of parts, connected together by resemblance, contiguity, or causation.
Gist of Idea
If identity survives change or interruption, then resemblance, contiguity or causation must unite the parts of it
Source
David Hume (Treatise of Human Nature [1739], I.IV.6)
Book Reference
'Personal Identity', ed/tr. Perry,John [University of California 1975], p.165