The ideology of the free market now has nothing to limit its claims. There is no visible countervailing power. There seems no sign of a check to its relentless advance. And its destructive potential, both for the coherence of human society and for the safeguarding of the environment, are formidable. The ideology of the free market has proved itself more powerful than Marxism. It is, of course, not just a way of arranging economic affairs. It has deep roots in the human soul. It can be met and mastered only at the level of religious faith, for it is a form of idolatry. The churches have hardly begun to recognize that this is probably their most urgent missionary task during the coming century.