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

"My own work was really quite simple. I just observed what was happening."

"The early days of penicillin were full of disappointments, but we never gave up."

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

"The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantitie…"