Descartes says that "I will suppose, then, not that God, who is supremely good and the fountain of truth, but that some malignant demon who is at once exceedingly potent and deceitful, has employed all his artifice to deceive me."

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This statement is a quote from Descartes' First Meditation in his book, "Meditations on First Philosophy." In this text, Descartes uses the idea of a deceptive demon as a thought experiment to explore the concept of skepticism and find a foundation for knowledge that cannot be doubted.

Descartes Says That "I Will Suppose, Then, Not That God