and carefully considered, that this proposition I am, I exist, is necessarily true each time it is expressed by me or conceived in my mind'. This argument 'I think therefore I am' is Descartes' cogito argument as in Latin it is cogito ergo sum. The cogito argument raises some difficulties, as when thinking results in existence not thinking should therefore result in non-existence leaving the problem of returning to thought from non-existence. Descartes could however reply that the term thought includes the conceiving and perception of all sensory input which is constant, resulting with a human being who thinks non-stop from bi!
             rth till death removing the problem of dropping out of existence periodically. Human beings are capable of simultaneous thought, this is best illustrated when a person is dreaming as the person will be receiving sensory data from both the external world and from the dream therefore the human is thinking on more than one level at a time which could result in there being two existence's. A further Cartesian response could be that the level of thought or the amount of thought is irrelevant, all that is important is that the thought is being generated by the one individual, therefore it is the one individual that exists. It is seemingly impossible to criticise the cogito argument as every time it is presented to our mind we are forced to assent to it, it may be the case that this argument is infallible or at least indubitable, Descartes therefore has convincingly overcome his doubt of his own existence.
             Now that Descartes realised that he was a thinking being he focused his efforts on trying to prove the existence of God for this Descartes has two arguments based on a priori reasoning, the Ontological argument and the Trademark argument.
             Descartes first argument for the existence of God is known as the Trademark argument. The argument states that we all
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