"I was just a dirty old man who left his dishes unwashed."

"The story of penicillin has been told so often that it is almost a cliché."

"Penicillin sat on my bench for ten years while I was called a quack."

"I have been working for many years on the problem of finding substances which would destroy microbes in the body without injuring the cells of 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."