"The laboratory worker who is not prepared to meet with occasional failures will never achieve success."

"The public will probably never understand the difficulties that beset the path of the original investigator."

"It is not wise to be too dogmatic in science. One must always be prepared to change one's mind."

"It is not often that one finds a substance that is both highly bactericidal and non-toxic to animal tissues."

"My laboratory was always a bit chaotic, but I knew where everything was."