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

"One must have a certain amount of daring to embark on a scientific career."

"One must make sure that one has good tools, and then one must use them well."

"The true character of a man is revealed in his actions, not in his words."

"To him who devotes his life to science, nothing can be more important than the study of its history."