I could not possibly exist with the nature I actually have, that is, one endowed with the idea of God, unless there really is a God; the very God, I mean, of whom I have an idea.

Agnoscam fieri non posse ut existam talis naturae qualis sum, nempe ideam Dei in me habens, nisi revera Deus etiam existeret, Deus inquam ille idem cujus idea in me est

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Original Citation

Descartes, René. Meditationes de Prima Philosophia, in qua Dei existentia et animæ immortalitas demonstratur [Meditations on First Philosophy, in which the existence of God and the immortality of the soul are demonstrated]. Paris, 1641, third meditation.

Current Citation

Descarte, René. "Meditations on First Philosophy." Discourse on Method and Meditations on First Philosophy, translated by Donald A. Cress. Hackett Publishing, 1999, third meditation.