"I had no idea at the time that I was making a discovery that would change the course of medicine."

"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…"

"I am only one of many who have contributed to the development of penicillin."

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

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