Leonardo da Vinci — "The greatest pleasure and the greatest knowledge is to understand why everything…"

"The noblest pleasure is the joy of understanding."

"The act of procreation and anything that has any relation to it is so disgusting that human beings would soon die out if it were not a traditional custom and if there were no pretty faces and sensuous…"

"Blind ignorance misleads us and makes us content with this empty life."

"Life is pretty simple: You do some stuff. Most of it doesn't work. If it doesn't work, you do something else. The thing that works, you do more of."

"The water that you touch in a river is the last of that which has passed, and the first of that which comes; so with present time."