Tears come from the heart and not from the brain. -Leonardo da Vinci

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Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.

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once you have tasted the taste of sky, you will forever look up

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If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.

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The wisest and noblest teacher is nature itself.

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Not to punish evil is equivalent to authorizing it.

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Just as iron which is not used grows rusty, and water putrefies and freezes in the cold, so the mind of which no use is made is spoilt. ― Leonardo da Vinci

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A bird is like an instrument working according to mathematical law, and it is in the capacity of man to reproduce such an instrument ― Leonardo da Vinci

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Tomaso of Florence. known as Masaccio, showed by his perfect works how those who took their nourishment from anything but nature, mistress of masters, were laboring in vain. ― Leonardo da Vinci

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Learning is the only thing that never disappoints us.

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