"I have been accused of being untidy. I confess to being untidy, but I have never allowed my untidiness to interfere with my work."

"I am not a hero. I just happened to be in the right place at the right time."

"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 story of penicillin has a certain romantic appeal, and I think that may be one of the reasons it has attracted so much attention. But the real story is much more prosaic."

"It is not enough to discover a thing; one must also know how to use it."