Full Idea
I affirm of the rest of mankind, that they are nothing but a bundle or collection of different perceptions, which succeed each other with an inconceivable rapidity, and are in perpetual flux and movement.
Gist of Idea
A person is just a fast-moving bundle of perceptions
Source
David Hume (Treatise of Human Nature [1739], I.IV.6)
Book Reference
'Personal Identity', ed/tr. Perry,John [University of California 1975], p.162
A Reaction
Note that Hume is not just saying what we can know of ourselves, but is asserting a view of what we actually are. The minimal objection to this is to ask how we know that a perception is a member of one big bundle rather than several small ones.