"The greatest joy of a scientist is to see his work used for the benefit of mankind."

"It is not the discovery of a new substance that is important, but the recognition of its properties."

"It has been said that I am a lucky man. I agree. I have been very lucky."

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

"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…"