From Arthur Schopenhauer:
“The more clearly you become conscious of the frailty, vanity, and dream-like quality of all things, the more clearly will you also become conscious of the eternity of your own inner being; because it is only in contrast to this that the aforesaid quality of things becomes evident, just as you perceived the speed at which a ship is going only when looking at the motionless shore, not when looking into the ship itself.”