CHARLES DARWIN:
“It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.”
http://thinkexist.com/quotes/charles_darwin/
FLORENCE NIGTHINGALE:
“Asceticism is the trifling of an enthusiast with his power, a puerile coquetting with his selfishness or his vanity, in the absence of any sufficiently great object to employ the first or overcome the last. [1857]”
http://womenshistory.about.com/cs/quotes/a/qu_nightingale.htm
STEPHEN HAWKING:
“To confine our attention to terrestrial matters would be to limit the human spirit.”
http://www.brainyquote.com/quotes/authors/s/stephen_hawking.html