Full Idea
Sometimes a man undergoes such changes that he cannot very well be said to be the same man, as was the case with a certain Spanish poet ...who was so oblivious of his past life that he did not believe the tales and tragedies he had composed were his own.
Gist of Idea
The poet who forgot his own tragedies was no longer the same man
Source
Baruch de Spinoza (The Ethics [1675], IV Pr 39)
Book Reference
Spinoza,Benedict de: 'Ethics', ed/tr. White,WH/Stirling,AH [Wordsworth 2001], p.193
A Reaction
This seems to need Locke's distinction between 'man' and 'person', since the poor poet was clearly the same human being. Spinoza places huge emphasis on the intellect as the essence of the man.