Man is never happy, but spends his whole life in striving after something which he thinks will make him so.
Arthur SchopenhauerMan is the only animal who causes pain to others with no other object than wanting to do so.
Arthur SchopenhauerAnd yet, just as our body would burst asunder if the pressure of the atmosphere were removed from it, so would the arrogance of men expand, if not to the point of bursting then to that of the most unbridled folly, indeed madness, if the pressure of want, toil, calamity and frustration were removed from their life. One can even say that we require at all times a certain quantity of care or sorrow or want, as a ship requires ballast, in order to keep on a straight course.
Arthur Schopenhauer