"I am unable to find any experimental evidence that supports the doctrine of spontaneous generation."

"Messieurs, c'est les microbes qui auront le dernier mot. (Gentlemen, it is the microbes who will have the last word.)"

"You have not succeeded in your experiments, that is all there is to it."

"I am often scolded by Madame Pasteur, but I tell her I shall lead her to fame."

"The more progress physical sciences make, the more they give us cause to believe that all phenomena are reducible to molecular forces."