Louis Pasteur — "Chance only favors the prepared mind."

"The more I learn, the more I realize how much I don't know."

"If I had the honor of being a surgeon… I would not only use absolutely clean instruments, but after having cleaned my hands with the greatest care, I would subject them to a rapid flaming."

"When I approach a child, he inspires in me two sentiments: tenderness for what he is, and respect for what he may become."

"I have been working so hard that I sometimes forget to eat."

"I have been for the past three years studying a disease which is called hydrophobia, or rabies. It is a disease which I believe to be caused by a microbe."