Rene Descartes — "Doubt is the origin of wisdom."
Doubt is the origin of wisdom.
Doubt is the origin of wisdom.
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"I have always taken the greatest pleasure in mathematics."
"It is not enough to walk with great strides, it is necessary to walk in the right road."
"I have always held that the two questions, God and the Soul, were the chief of those which ought to be demonstrated by the help of philosophy rather than of theology."
"The first precept was never to accept a thing as true until I knew it as such without a single doubt."
"The preservation of health has always been the principal end of my studies."
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