It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.  

The only real voyage of discovery consists not in seeking new landscapes, but in having new eyes.

The existence of the natural world is the same kind of fact as the existence of any proposition.

The work of art is a fragment of eternity.

最终，我们记住的不是敌人的话语，而是朋友的沉默。