Quote by Archimedes

"To understand one must first unlearn; to know one must first doubt."

Archimedes
Mathematician and Engineer Greek -287–-212

More from Archimedes

"Give me a lever long enough and a fulcrum on which to place it, and I shall move the world."
"Eureka! Eureka!"
"Do not disturb my circles."
"The shortness of life cannot dissuade us from its generous pursuit."

All quotes by Archimedes