Descartes : Discourse On Method Rene Descartes. substance be in my mind owing to this, that I myself am a substance, I should not, however, have the idea of an infinite substance, seeing I am a finite ... reality infinite. And I must not ... With the celebrated words 'I think therefore I am', Descartes' compelling argument swept aside ancient and medieval traditions. He deduced that human beings consist of minds and bodies; that these are totally distinct 'substances'; that God exists and that He ensures we can trust the evidence of our senses. Ushering in the 'scientific revolution' of Galileo and Newton, Descartes' ideas have also set the agenda for debate ever since. By calling everything into doubt, Descartes laid the foundations of modern philosophy.

Descartes relied heavily on the idea of infinity, most crucially in his first cosmological argument for God 's existence in the Third Meditation. He argues that my idea of God's infinity is not derived by negating my own finitude nor by extrapolating from my own limited intellectual growth; on the contrary, my perception of the actually infinite is prior to my perception of the finite and the merely potential. Moreover, this idea is “utterly clear and distinct” and contains maximal objective reality (AT VII 46, CSM II 31) (see clarity and distinctness ). So it can only have come from a substance that contains infinite formal reality – that is, God (see being, formal versus objective ). God alone is strictly infinite. Yet there are created beings, like extension and numbers, which are unlimited in certain respects. So Descartes introduces a technical distinction between the infinite, “that in which no limits of any kind can be found,” and the indefinite, that in which “there is merely some respect in which I do not recognize a limit” (AT VII 113, CSM II 81; cf. AT V 355–56, CSMK 377). The distinction is ontological in the first instance; it concerns the degree of limitlessness in things. An ordinary body , for example, is limited in size but unlimited in divisibility . The extension of the universe beyond the earth and stars, which Descartes sometimes calls “imaginary space,” is unlimited in size but limited in power, intelligence, and the like (AT III 274–75, CSMK 166). But D

The prime fact in philosophy was to him, as to Augustine and Descartes, the certainty of individual consciousness. To this consciousness he assigned a threefold content, power, will and knowledge. It is of the present only, of things not as they are, but merely as they seem. The fact that it contains the idea of God is the one, and a sufficient, proof of the divine existence, since the idea of the Infinite must be derived from the Infinite. God is therefore a unity, possessing, in the perfect degree, those attributes of power, will and knowledge which humanity possesses only in part. Furthermore, since community of action presupposes homogeneity, it follows that the world and all its parts have a spiritual nature. The emotions of love and hate are in everything. The more remote from God, the greater the degree of imperfection (i.e. Not-being) in things. Of imperfect things, the highest are angels and human beings, who by virtue of the possession of reason are akin to the Divine and superior to the lower creation. Next comes the mathematical world of space, then the corporeal world, and finally the empirical world with its limitations of space and time.

(7:144). Descartes then applies that principle not to the mere existence of the idea of God as a state ... I.14, 19). Descartes used this idea of God to fashion an argument for the existence of God , now called ... and innate idea of God to the existence of that God . Whatever one may think of the quality of this argument ...

objected by some of the critics of Descartes that the idea of God as the infinite Being is merely negative, and that it is derived from the finite simply by

distinct ideas to prove God's existence (4th). Contrary to what Descartes argues, we are certain that bodies exist/that perception coincides with reality (5th Meditations on First Philosophy, in which the existence of God and the immortality of the soul are demonstrated (Latin: Meditationes de Prima Philosophia, in qua Dei existentia et animæ immortalitas demonstratur), often simply called Meditations on First Philosophy or the Meditations, is a philosophical treatise by René Descartes first published in Latin in 1641. The French translation (by the Du In… I have a "strong inclination" to believe in the reality of external material things due to my senses. God must have created me with this nature. If independent material things do not exist, God is a deceiver. But God is not a deceiver. So material things exist and contain the properties essential to them. After using these two arguments to dispel solipsism and skepticism, Descartes seems to have succeeded in defining reality as being in three parts: God (infinite), minds, and material things (both finite). He closes by addressing natural phenomena that might appear to challenge his philosophy, such as phantom limbs, dreams, and dropsy.