Chi semina virtù fama raccoglie. - Leonardo da Vinci

He had searched to find a scientific basis for art, and discovered it in the imitation of nature, based on rational experience.

No human investigation can be called real knowledge if it does not pass through mathematical demonstrations; and if you say that the kinds of knowledge that begin and end in the mind have any value as truth, this cannot be conceded, but rather must be denied for many reasons, and first of all because in such mental discussions there is no experimentation, without which nothing provides certainty of itself.

Just as a well-filled day brings blessed sleep, so a well-employed life brings a blessed death