"The greatest discovery of my life was not penicillin, but the fact that I was wrong about something."

"The discovery of penicillin was a stroke of luck, but it was also the result of many years of hard work."

"When I woke up just after dawn on September 28, 1928, I certainly didn't plan to revolutionize all medicine by discovering the world's first antibiotic, or bacteria killer. But I suppose that was exac…"

"The story of penicillin is a lesson in serendipity and perseverance."

"I have been working for many years on the problem of finding substances which would destroy microbes in the body without injuring the cells of the body."