He gives examples of three different ways in which he may be wrong about how he perceives the world. Firstly he uses the argument from illusion; (the stick in the water) to show that his senses are not reliable. Secondly he suggests he could be dreaming: the argument from dreaming. And thirdly he considers that a malignant demon may be deceiving him deliberately about everything: the argument from deception.
We also learned the meaning of ‘epistemology’, it is the study of what it is possible to know: is knowledge of the world possible, if so what?
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