Can you find the self you are so sure you have?
What it argues
Hume looks for the self by introspection and finds only particular perceptions: heat, light, a thought, never a simple impression of a self. The self is a bundle, and the sense of continuity is produced by imagination and memory. The argument is empirical: it asks you to look, and to report what is actually there.
The probe
One minute of noticing, then write only what was present. Count how many items were you and how many were objects, sensations, or words.
The source
A Treatise of Human Nature, I.iv.6 — David Hume, 1739. The link goes to the text or to a catalogue record for it, not to a summary. This one is the text itself.