After his theological studies he became a doctor of theology and taught at universities in different countries. He spoke six languages (including German), has worked as a teacher and lecturer in Italy, England and the United States and was a keynote speaker worldwide. In February 2007, he spoke at the World Conference in
Cape Town, South Africa on the relationship between faith and freedom. In particular, he considered the unfolding and deepening of Judeo-Christian dialogue to be a prerequisite for interreligious and interdenominational dialogue on the unfolding of faith in the spirit of freedom as a form of struggle for human dignity. He dealt with the variants of religious fundamentalism, which counteract humble human coexistence in the one humanity. ==Writings==