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" "I will follow this strategy until I discover something that is certain or, at least, until I discover that it is certain only that nothing is certain.
René Descartes (March 31, 1596 – February 11, 1650) was a highly influential French philosopher, mathematician, physicist and writer. He is known for his influential arguments for substance dualism, where mind and body are considered to have distinct essences, one being characterized by thought, the other by spatial extension. He has been dubbed the "Father of Modern Philosophy" and the "Father of Modern Mathematics." He is also known as Cartesius.
Biography information from Wikiquote
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Remembering, however, as I have already said, that the natural light is to be
trusted only in so far as nothing to the contrary is revealed by God Himself. …
Moreover, it must be fixed in one's memory as the highest rule, that what has
been revealed to us by God is to be believed as the most certain of all things;
and even though the light of reason should seem most clearly to suggest
something else, we must nevertheless give creedence to the divine authority
only, rather than our own judgment. (Principia philosophiae, pars prima 28 and
76.)