JOHN LOCKE (1632-1704)
There once was a man named
John Locke,
Who liked finding Cartesians
to mocke.
But when those on his side
Judged that Jekyll was Hyde,
'Twas a real metaphysical shocke.
Note: In An Essay Concerning Human Understanding
(1690), Locke argues that a person is “a thinking intelligent Being, that has
reason and reflection, and can consider it self as it self, the same thinking
thing in different times and places”. He
goes on to say that sameness of person is determined by sameness of
consciousness. He asks us to “suppose two
distinct incommunicable consciousnesses acting the same Body, the one
constantly by Day, the other by Night”, and claims that the Day-Man and the
Night-Man would be “as distinct Persons, as Socrates
and Plato”. So Locke would say that Jekyll and Hyde are
different persons. Cartesians, who think
that persons are souls, would say that Jekyll and Hyde are the same person, as
long as the same soul thinks in the same body by day and by night.