"It is a wonderful thing to be able to save lives with a simple substance."

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

"I have been fortunate in my life to have seen the benefits of my discovery."

"I had no idea that I would be involved in such a great discovery. It was purely accidental."

"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…"