Who said "Nature is not cruel, only we are cruel."?

This quote is attributed to Leonardo da Vinci.

Nature is not cruel, only we are cruel. - Leonardo da Vinci

"Nature is not cruel, only we are cruel."

Leonardo da Vinci Nature

Polymath Artist Scientist Italian 1452–1519

"Learning never exhausts the mind."

"Simplicity is the ultimate sophistication."

"The observer sees what he observes."

"Art is the queen of all sciences."

"Nature teaches us about beauty."

"Nature teaches us patience and wisdom"

"Sometimes it snows in April."

"Every town has a soul, and Twin Peaks has a troubled one."