Humanity may destroy the possibilities for life on earth unless the freedom and power that we have acquired are channeled in new creative directions by a spiritual awareness and moral commitment that transcend nationalism, racism, sexism, religious sectarianism, anthropocentrism, and the dualism between human culture and nature. This is the great issue for the 1990s and the twenty-first century.

Spirit and nature: why the environment is a religious issue : an interfaith dialogue (ed. Beacon Pr, 1992)