Descartes characterize the self as it is an immaterial thinking thing that interacts with the material body.
Descartes makes the case that the self can be accurately viewed as either a mind or a human person, and that the self's qualities vary correspondingly, in the Meditations and other publications from the early 1640s. For instance, whereas the self is compositely regarded to be a human being, the self is simply considered to be a mind.
One essential certainty that the Cartesian self is capable of is that, even if everything else is open to doubt, one cannot seriously doubt that one is thinking because to doubt is to think.
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