Cartesian Doubt
Cognito il Sum
Using Language to prove that the external world exists. For words to have correct meanings they must have some connection to the external world; Wittgenstien calls this the picture representation. As words are representations of objects, we necessarily require objects to be referred to. If the words do not represent anything that exists in the world, then language meaning is unattainable therefore meaningless. To propose a meaningful/valid Cartesian skeptical argument; i.e. I doubt whether my senses are true, as I could be dreaming, one must have clear understanding of the words "doubt", "senses", "Truth" etc. However without an external world, appropriate meaning of these words cannot be attained. Therefore in the hypothetical possible world, (where the external world is a dream) the words no longer make reference to anything. The argument is constructed with words that have no meaning. Without any meaning the proposition breaks down. One might as well be constructing a sentence with words that don't exist. However, we can construct a valid arguemnt arguing for the external world, as the external world is necessary for language to work. Wittegenstien proposes that as we can produce meanigful propositions as arguments when the words symbolise, represent objects in an external world. This doesn't mean we can prove that the external world exists, however it does show us that we cannot meanigfully debate it with Language, for without and external world there cannot be language.