I like the fact that Benedict's sixth degree of humility (on contentment, R.B. 7. 49-50, which you can listen to here), is read every year on the feast of St Francis. Francis is the archetypal happy man, happy because he knew how to be content, whatever happened. His contentment derived from his sense of the goodness and nearness of God. That did not make him complacent but enabled him to see what many of us fail to see: that even negative experiences, such as having the door slammed in one's face after a long and difficult journey, as happened to Francis himself, can be a cause for joy. It is not the event itself but how we perceive it that matters.