Alexander Fleming — "It is not wise to be too dogmatic in science. One must always be prepared to cha…"

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

"The greatest tragedy is the misuse of a good thing."

"Nature makes penicillin; I just found it."

"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."

"The mould was very interesting. I cultured it and found it produced a powerful antibacterial substance. It was very effective against staphylococci and other Gram-positive pathogenic bacteria."