From Cardinal Joseph Ratzinger’s wonderful book, Salt of the Earth:
The loss of joy does not make the world better — and, conversely, refusing joy for the sake of suffering does not help those who suffer. The contrary is true. The world needs people who discover the good, who rejoice in it and thereby derive the courage and impetus to do good.
We have a new need for that primordial trust which ultimately faith can give. That the world is basically good, that God is there and is good. That it is good to live and be a human being. This results, then, in the courage to rejoice, which in turn becomes commitment to making sure that other people, too, can rejoice and recieve good news.