VATICAN CITY (CNS) -- Involvement in politics is a role reserved to laypeople, but Catholic Church leaders must explain and promote the moral principles that will contribute to the common good, Pope Benedict XVI said. "The church, while recognizing that it is not a political agent, cannot abstain from taking an interest in the good of the whole civil community in which it lives and works," the pope said in a message published Oct. 18. The papal message marked the 100th annual celebration of a week dedicated to studying Catholic social teaching sponsored by the Italian bishops' conference. Working for...