More quotes by Leonardo da Vinci

"As a well spent day brings happy sleep, so life well used brings happy death."
"All our knowledge has its origin in our perceptions"
"It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things."
"The human foot is a masterpiece of engineering and a work of art."
"Our life is made by the death of others."