"My work was not a flash of genius, but a gradual unfolding of facts."

"I am not a hero. I just happened to be in the right place at the right time."

"It is not an exaggeration to say that the discovery of penicillin has saved millions of lives."

"It is a happy accident that the mold grew on my plate, but it was not an accident that I recognized it."

"I am often asked if I foresaw the impact of penicillin. My honest answer is no."