“Anyone who has never made a mistake has never tried anything new.”

“Never do anything against conscience, even if the state demands it.”

“You never fail until you stop trying.”

“The only sure way to avoid making mistakes is to have no new ideas.”

“No one does anything right in life, until they realize that they are making a mistake”

“I never made one of my discoveries through the process of rational thinking”

“Somebody who only reads newspapers and at best books of contemporary authors looks to me like an extremely near-sighted person who scorns eyeglasses. He is completely dependent on the prejudices and fashions of his times, since he never gets to see or hear anything else.”