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 concluded that I was a substance whose whole essence or nature consists in thinking, and whose being does not depend on any place or any material thing."
"I have never had any experience that was not accompanied by some thought."
"Perfect numbers like perfect men are very rare."
"It is not enough to apply our mind to things, but we must also apply it to ourselves."
"The custom of believing what others believe, and of doing what others do, is the most powerful obstacle to the discovery of truth."
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