...because of being glad about too many things.
Papa Benedict is a Pollyanna Catholic too. Read what he says for World Youth Day:
"Joy has to be shared. Go and tell other young people about your joy at finding the precious treasure which is Jesus himself. We cannot keep the joy of faith to ourselves. If we are to keep it, we must give it away. Saint John said: “What we have seen and heard we proclaim now to you, so that you too may have fellowship with us; we are writing this so that our joy may be complete” (1 Jn 1:3-4).
Christianity is sometimes depicted as a way of life that stifles our freedom and goes against our desires for happiness and joy. But this is far from the truth. Christians are men and women who are truly happy because they know that they are not alone. They know that God is always holding them in his hands. It is up to you, young followers of Christ, to show the world that faith brings happiness and a joy which is true, full and enduring. If the way Christians live at times appears dull and boring, you should be the first to show the joyful and happy side of faith. The Gospel is the “good news” that God loves us and that each of us is important to him. Show the world that this is true!"
And there's more: read it all here...