However, there are numerous beliefs that his argument leaves unchallenged. When we dream, although the particular beliefs we form ("I am falling from an airplane.") are often false, the materials for our dream (airplanes, physical objects) come from things we experience when waking, and we can still rest assured that some of these things exist. Therefore, the dreaming argument leaves unchallenged our belief in general truths about the world (the belief that we have hands and what these hands do for us).

One of the reasons Descartes believed his mind to be essentially non-physical is that he found himself able to doubt the existence of all physical objects (even his own hand) but could not doubt that he was a thinking being (Williams, 1998). Descartes also believed that, in contrast to the physical world, the mind was an indivisible unit.

Even Descartes realized that mind and body were unable to...
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