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

"The laboratory worker who is not prepared to meet with occasional failures will never achieve success."

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

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

"A good gulp of hot whisky at bedtime—it's not very scientific, but it helps."