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

"I have been asked to say a few words about the discovery of penicillin. I must confess that I have been asked to do this so often that I am beginning to be a little tired of it."

"I can only warn. It is up to others to heed the warning."

"My greatest satisfaction comes from knowing that my work has saved countless lives."

"That's funny."