"A good many people think that I deserve some credit for the discovery of penicillin. They are wrong. It was discovered by nature."

"I never sought fame or fortune, only to contribute to human knowledge."

"The future of chemotherapy lies in the intelligent use of these new antibacterial agents."

"It is not enough to discover a thing; one must also know how to use it."

"Nature makes penicillin; I just found it."