63 For actually this growth in the social life of man is not a product of natural forces working, as it were, by blind impulse. It is, as we saw, the creation of men who are free and autunomous by nature—though they must, of course, recognize and, in a sense, obey the laws of economic development and social progress, and cannot altogether escape from the pressure of environment.
Source: Mater et Magistra (Vatican.va)