Meditations And Other Metaphysical Writings by Rene Descartes

in which the existence of God and the immortality of the soul are demonstrated

A sustained philosophical inquiry that subjects all beliefs to radical doubt in order to find indubitable foundations for knowledge, beginning with the certainty of the thinking self and using the criterion of clear and distinct perception to rebuild a reliable body of knowledge; it develops arguments for the existence of a benevolent God who guarantees truth, defends a sharp mind–body distinction (dualism), and contrasts the fallibility of the senses with the primacy of reason while examining the nature of material extension and consciousness.

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