Leonardo Boff is professor emeritus of ethics, philosophy of religion and ecology at Rio de Janeiro State University.
Many people wonder why, as a theologian and a philosopher by training, I should address topics that are alien to these disciplines, such as ecology, politics, global warming and others.
I always reply: I do pure theology, but I also deal with other topics
simply because I am a theologian. "The job of a theologian," as Thomas Aquinas, the master theologian of them all, explained in the first question of the Summa Theologica, "is to study God and divine revelation, and after that, everything else 'in the light of God'(sub ratione Dei), because God is the beginning and the end of everything."