"Science is not only a discipline of reason but also one of romance and passion."

"The scientist's most important tool is his imagination."

"My original decision to devote myself to science was a direct result of the discovery, which has never ceased to fill me with enthusiasm, that the laws of nature are accessible to human thought."

"Religion and natural science are fighting a joint battle in an incessant, never-ending crusade against skepticism and against dogmatism, against unbelief and against superstition, and as the motto for…"

"No burden is so heavy for a man to bear as a succession of happy days."