Leonardo da Vinci Quotes About Certainty
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Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.
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Slender certainty is better than portentous falsehood.
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Those who condemn the supreme certainty of mathematics feed on confusion, and can never silence the contradictions of the sophistical sciences which lead to eternal quackery.
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He who does not understand the supreme certainty of mathematics is wallowing in confusion.
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To me it seems that those sciences are vain and full of error which are not born of experience, mother of all certainty, first-hand experience which in its origins, or means, or end has passed through one of the five senses.
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No human investigation can claim to be scientific if it doesn't pass the test of mathematical proof.
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We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary to the senses, such as the existence of God and the soul.
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