"If penicillin can cure those that are ill, Spanish sherry can bring the dead back to life."

"I was not looking for penicillin when I discovered it. I was looking for a better antiseptic."

"It is a wonderful thing to be able to save lives with a simple substance."

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

"It is not difficult to make microbes resistant to penicillin in the laboratory by exposing them to concentrations not sufficient to kill them."