" I can stand out the war with any man," Forence Nightingale.
( This quote relates not only to Nightingales time during the war, but also to life in general. Stating that women can endure the same hardships as men, but above all women are equal to men. - equality)

"If human life were long enough to find the ultimate theory, everything would have been solved by previous generations. Nothing would be left to be discovered," Stephen Hawkins. ( This quote reflects on the excitement of discovering new things.)

"A man who dares to waste one hour of time has not discovered the value of life," Charles Darwin. (This quote illustrates quite simply the value of life, and not wasting one moment of it.)