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

"I did not invent penicillin. Nature did. I just found it."

"The world is full of interesting things. You just have to look for them."

"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 discovery of penicillin was a series of lucky accidents."