In his own life, then, a man is not to expect happiness,
only to profit by it gladly when it shall arise;
he is on duty here;
he knows not how or why, and does not need to know;
he knows not for what hire, and must not ask.
Somehow or other, though he does not know what goodness is,
he must try to be good;
somehow or other, though he cannot tell what will do it,
he must try to give happiness to others.
-Robert Louis Stevenson