Full Idea
Descartes gives no clear criterion for individuating mental substances.
Gist of Idea
Descartes gives no clear criterion for individuating mental substances
Source
comment on René Descartes (Meditations [1641], §6.78) by John Cottingham - The Rationalists p.86
Book Reference
Cottingham,John: 'The Rationalists' [OUP 1988], p.86
A Reaction
Presumably I can individuate my own mind by the 'natural light' of reason, and the implications of the Cogito. The minds of others do seem to be a problem. Why should they coincide with bodies, and not overlap or blend or swap?