“If a little knowledge is dangerous, where is the man who has so much as to be out of danger?”

“Try to learn something about everything and everything about something.”

“The great tragedy of Science — the slaying of a beautiful hypothesis by an ugly fact.”

“The known is finite, the unknown infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to reclaim a little more land.”

“It is the unknown that excites the ardor of scholars, who, in the known alone, would wither.”