Anyone who in discussion relies upon authority uses, not his understanding, but rather his memory. - (Da Vinci, Leonardo - Authority)

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue. - (Da Vinci, Leonardo - Body)

Common Sense is that which judges the things given to it by other senses. - (Da Vinci, Leonardo - Common Sense)

While I thought that I was learning how to live, I have been learning how to die. - (Da Vinci, Leonardo - Death and Dying)

As a well-spent day brings happy sleep, so a life well spent brings happy death. - (Da Vinci, Leonardo - Death and Dying)

I have offended God and mankind because my work didn't reach the quality it should have. - (Da Vinci, Leonardo - Excellence)

Experience does not err. Only your judgments err by expecting from her what is not in her power. - (Da Vinci, Leonardo - Experience)

Just as courage imperils life; fear protects it. - (Da Vinci, Leonardo - Fear)

Men of lofty genius when they are doing the least work are most active. - (Da Vinci, Leonardo - Genius)

[Three classes of people]: Those who see. Those who see when they are shown. Those who do not see. - (Da Vinci, Leonardo - Humankind)

Just as iron rusts from disuse, even so does inaction spoil the intellect. - (Da Vinci, Leonardo - Idleness)

Our life is made by the death of others. - (Da Vinci, Leonardo - Life and Living)

Iron rusts from disuse, stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigors of the mind. - (Da Vinci, Leonardo - Mind)

As every divided kingdom falls, so every mind divided between many studies confounds and saps itself. - (Da Vinci, Leonardo - Mind)

A good painter is to paint two main things, men and the working of man's mind. - (Da Vinci, Leonardo - Painters and Painting)