I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.
Thomas A. EdisonUntil man duplicates a blade of grass, nature can laugh at his so-called scientific knowledge. Remedies from chemicals will never stand in favor compared with the products of nature, the living cell of the plant, the final result of the rays of the sun, the mother of all life.
Thomas A. EdisonAnything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.
Thomas A. Edison