The kind of certainty we can have for Descartes depends on clarity and distinctness of perception, which is a criterion of truth that Descartes extracts in the Third Meditation based on the cogito argument made in the Second Meditation (Descartes, 1985, Vol. 1). In his Principles of Philosophy (Descartes, 1985, p.207) Descartes explains that by clarity he understands what is present to the attentive gaze of the mind and by distinctness what separates the content of the mind from everything else. In the cogito argument we immediately perceive the necessary connection between thinking and existence, it is not possible for me to think and not exist. Further certainty may be distinguished into subjective certainty and objective certainty. The cogito argument gives us only subjective certainty because from it we can infer that we are thinking and that we are constrained to think in a certain way as a matter of psychological necessity but it does not allow us to answer scepticism about...
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