"The thought that I might have discovered something which would be of value in treating disease was, of course, uppermost in my mind."

"I often wonder how many other useful molds have been thrown away by bacteriologists."

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

"We must be careful not to create a race of penicillin-resistant superbugs."

"My laboratory was always a bit chaotic, but I knew where everything was."