... on. He uses the analogy of a building, the fundamental beliefs are its foundations and if you remove those all built on them will collapse. Therefore, if he finds reason to doubt these beliefs, all built on them can be doubted. This is a good argument as logically it makes sense, the problems with it are that different people may have different interpretations of the argument and different ideas of what the fundamental beliefs actually are. Descartes believes the most fundamental of beliefs is that you can trust the senses. He says "Everything that I have accepted as being most true up until now I have acquired from the senses or through the senses." He also notes however that his senses occasionally deceive him and he thinks that "...it is prudent never to trust those who have deceived us, even if only once." This is a weak point in the argument ...

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