God, grant me the serenity to accept the things I cannot change, Courage to change the things I can change, And the wisdom to know the difference. Happiness does not depend upon a full pocket-book, but on a mind full of thoughts that are rich and a heart full of rich emotions. Happiness does not depend upon what happens externally, but upon what takes place inside a person. Happiness is a state of mind. Happiness does not come from doing what you like to do, it comes from liking what we have to do.
Happiness comes from putting our hearts into our work and doing it with joy and enthusiasm.
It does not come from doing easy work, but it is the afterglow of satisfaction that comes from an achievement of a difficult task that demands our best.