Can Descartes be certain that he is thinking How Can he be certain that he exists How (And who is he)
Descartes? statement ?I think therefore I exist? raises questions about the meaning of thought, the meaning of existence but most fundamentally, in what sense he can be certain. The difficulty in establishing the certainty of ?I think? and ?I exist? is that the two concepts are interrelated. Thus, for example, differing interpretations of what it is to think will have a profound impact on the question of whether Descartes can achieve the certainty of his existence. The success of his attempt to achieve certainty can be analysed in relation to how far he overcomes the universal doubt he has introduced in the first meditation. It is in this sphere of meaning that ?I? becomes very relevant as it is possible to argue that his use of ?I? demonstrates that his own interpretation of what is certain is partially based on intrinsically held beliefs.
Williams describes the statement ?I think? as indubitable. This is because ?if anyone believes he is thinking or that he exists then necessarily he has a true belief.? Using the Cartesian method, the statement that ?I
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