"I found penicillin and have given it free for the benefit of humanity. Why should it become a profit-making monopoly of manufacturers in another country?"

"The bacteriologist must be a patient man."

"The greatest tragedy is the misuse of a good thing."

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

"I have been asked by many people how I came to discover penicillin. The answer is that I did not discover it. I just happened to notice it."