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

"The next time you are tempted to throw away a contaminated culture, remember the penicillin."

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

"It is a popular misconception that I was a brilliant chemist, but I was not. I was a bacteriologist."

"It is the lone worker who makes the first advance in a subject; the details may be worked out by a team, but the prime idea is due to enterprise, thought, and perception of an individual."