The pollution of the outward environment we are witnessing is only the mirror and the consequence of the inward environment, to which we pay too little heed. I think that this is also the defect of the ecological movements. They crusade with an understandable and also legitimate passion against the pollution of the environment, whereas man's self-pollution of his soul continues to be treated as one of the rights of his freedom. There is a discrepancy here. We want to eliminate the measurable pollution, but we don't consider the pollution of man's soul and his creaturely form.... he must acknowledge himself as a creature and realise that there must be a sort of inner purity to his creatureliness: spiritual ecology, if you will." Joseph Cardinal Ratzinger, Salt of the Earth, Ignatius Press, 1997, pp. 230-231