Full Idea
Let a person once find himself conscious of any of the actions of Nestor, he then finds himself the same person with Nestor.
Clarification
Nestor was a Greek, present at the siege of Troy
Gist of Idea
If someone becomes conscious of Nestor's actions, then he is Nestor
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.27.14)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.340
A Reaction
This seems to invite the sort of response Butler offered, that it would be a given that it was YOU who was thinking Nestor's thoughts, and presumably becoming puzzled thereby. If I imagine Troy, am I thinking Nestor's thoughts?