"I have in fact been a very lucky fellow; I have often said that I should be a very miserable creature if I could not feel that I was doing something for the good of other people."

"The lecturer should endeavor to rouse the minds of his auditors, and to fix their attention."

"The world little knows how many of the thoughts and theories which have passed through the mind of a scientific investigator have been crushed in silence and secrecy by his own severe criticism and ad…"

"The very best way to learn is to do."

"It is not enough to know, we must apply. It is not enough to will, we must do."