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

"The scientific life is a life of constant battle against error."

"I have great hopes that the vaccine against rabies will be a success."

"A bottle of wine contains more philosophy than all the books in the world."

"We must not forget that science, like all human activities, has its limits."