"Test knowledge through experience, be prepared to..." - Quote by Leonardo Da Vinci

“The painter who draws by practise and judgment of the eye without the use of reason is like the mirror which reproduces within itself all the objects which are set opposite to it without knowledge of the same.”

“Learning never exhausts the mind.”

“No human investigation can be called real science if it cannot be demonstrated mathematically.”

“A multitude of books distracts the mind.”

“What is wrong with priests and popes is that instead of being apostles and saints, they are nothing but empirics who say I know instead of I am learning, and pray for credulity and inertia as wise men pray for skepticism and activity.”

“I am sure that the mistakes of that time will not be repeated; we should probably make another set of mistakes.”

“Scars are wisdom in disguise.”

“Life, he decided, was for living, not for having, and he wanted to experience every moment that he could.”

“The necessity of labor and conversation with many men and things to the scholar is rarely well remembered.”