Alexander Fleming — "The most important thing in science is not to get discouraged by failures."

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

"I am not a very good speaker, but I hope my work speaks for itself."

"It is not difficult to make microbes resistant to penicillin in the laboratory by exposing them to concentrations not sufficient to kill them, and the same thing has occasionally happened in the body."

"The mere fact that a substance has bactericidal powers does not mean that it can be used for the treatment of septic infections."

"It is remarkable how easily the public can be misled by sensational statements."